Nerves, or sinews, are membranes without, and full of marrow within; they proceed from the brain, and carry the animal spirits for sense and motion.

Of these some be harder, some softer; the softer serve the senses, and there be seven pair of them. The first be the optic nerves, by which we see; the second move the eyes; the third pair serve for the tongue to taste; the fourth pair for the taste in the palate; the fifth belong to the ears; the sixth pair is most ample, and runs almost over all the bowels; the seventh pair moves the tongue. The harder sinews serve for the motion of the inner parts, proceeding from the marrow in the back, of whom there be thirty combinations, seven of the neck, twelve of the breast, &c.

_Arteries_.] Arteries are long and hollow, with a double skin to convey the vital spirit; to discern which the better, they say that Vesalius the anatomist was wont to cut up men alive. [958]They arise in the left side of the heart, and are princ.i.p.ally two, from which the rest are derived, aorta and venosa: aorta is the root of all the other, which serve the whole body; the other goes to the lungs, to fetch air to refrigerate the heart.

_Veins_.] Veins are hollow and round, like pipes, arising from the liver, carrying blood and natural spirits; they feed all the parts. Of these there be two chief, _Vena porta_ and _Vena cava_, from which the rest are corrivated. That _Vena porta_ is a vein coming from the concave of the liver, and receiving those mesaraical veins, by whom he takes the chylus from the stomach and guts, and conveys it to the liver. The other derives blood from the liver to nourish all the other dispersed members. The branches of that _Vena porta_ are the mesaraical and haemorrhoids. The branches of the _cava_ are inward or outward. Inward, seminal or emulgent.

Outward, in the head, arms, feet, &c., and have several names.

_Fibrae, Fat, Flesh_.] Fibrae are strings, white and solid, dispersed through the whole member, and right, oblique, transverse, all which have their several uses. Fat is a similar part, moist, without blood, composed of the most thick and unctuous matter of the blood. The [959]skin covers the rest, and hath _cuticulum_, or a little skin tinder it. Flesh is soft and ruddy, composed of the congealing of blood, &c.

SUBSECT. IV.--_Dissimilar Parts_.

Dissimilar parts are those which we call organical, or instrumental, and they be inward or outward. The chiefest outward parts are situate forward or backward:--forward, the crown and foretop of the head, skull, face, forehead, temples, chin, eyes, ears, nose, &c., neck, breast, chest, upper and lower part of the belly, hypocondries, navel, groin, flank, &c.; backward, the hinder part of the head, back, shoulders, sides, loins, hipbones, _os sacrum_, b.u.t.tocks, &c. Or joints, arms, hands, feet, legs, thighs, knees, &c. Or common to both, which, because they are obvious and well known, I have carelessly repeated, _eaque praecipua et grandiora tantum; quod reliquum ex libris de anima qui volet, accipiat_.

Inward organical parts, which cannot be seen, are divers in number, and have several names, functions, and divisions; but that of [960]Laurentius is most notable, into n.o.ble or ign.o.ble parts. Of the n.o.ble there be three princ.i.p.al parts, to which all the rest belong, and whom they serve--brain, heart, liver; according to whose site, three regions, or a threefold division, is made of the whole body. As first of the head, in which the animal organs are contained, and brain itself, which by his nerves give sense and motion to the rest, and is, as it were, a privy counsellor and chancellor to the heart. The second region is the chest, or middle belly, in which the heart as king keeps his court, and by his arteries communicates life to the whole body. The third region is the lower belly, in which the liver resides as a _Legat a latere_, with the rest of those natural organs, serving for concoction, nourishment, expelling of excrements. This lower region is distinguished from the upper by the midriff, or diaphragma, and is subdivided again by [961]some into three concavities or regions, upper, middle, and lower. The upper of the hypocondries, in whose right side is the liver, the left the spleen; from which is denominated hypochondriacal melancholy. The second of the navel and flanks, divided from the first by the rim. The last of the water course, which is again subdivided into three other parts. The Arabians make two parts of this region, _Epigastrium_ and _Hypogastrium_, upper or lower.

_Epigastrium_ they call _Mirach_, from whence comes _Mirachialis Melancholia_, sometimes mentioned of them. Of these several regions I will treat in brief apart; and first of the third region, in which the natural organs are contained.

_De Anima.--The Lower Region, Natural Organs_.] But you that are readers in the meantime, "Suppose you were now brought into some sacred temple, or majestical palace" (as [962]Melancthon saith), "to behold not the matter only, but the singular art, workmanship, and counsel of this our great Creator. And it is a pleasant and profitable speculation, if it be considered aright." The parts of this region, which present themselves to your consideration and view, are such as serve to nutrition or generation.

Those of nutrition serve to the first or second concoction; as the oesophagus or gullet, which brings meat and drink into the stomach. The ventricle or stomach, which is seated in the midst of that part of the belly beneath the midriff, the kitchen, as it were, of the first concoction, and which turns our meat into chylus. It hath two mouths, one above, another beneath. The upper is sometimes taken for the stomach itself; the lower and nether door (as Wecker calls it) is named Pylorus.

This stomach is sustained by a large kell or caul, called omentum; which some will have the same with peritoneum, or rim of the belly. From the stomach to the very fundament are produced the guts, or intestina, which serve a little to alter and distribute the chylus, and convey away the excrements. They are divided into small and great, by reason of their site and substance, slender or thicker: the slender is duodenum, or whole gut, which is next to the stomach, some twelve inches long, saith [963]

Fuschius. Jejunum, or empty gut, continuate to the other, which hath many mesaraic veins annexed to it, which take part of the chylus to the liver from it. Ilion the third, which consists of many crinkles, which serves with the rest to receive, keep, and distribute the chylus from the stomach.

The thick guts are three, the blind gut, colon, and right gut. The blind is a thick and short gut, having one mouth, in which the ilium and colon meet: it receives the excrements, and conveys them to the colon. This colon hath many windings, that the excrements pa.s.s not away too fast: the right gut is straight, and conveys the excrements to the fundament, whose lower part is bound up with certain muscles called sphincters, that the excrements may be the better contained, until such time as a man be willing to go to the stool. In the midst of these guts is situated the mesenterium or midriff, composed of many veins, arteries, and much fat, serving chiefly to sustain the guts. All these parts serve the first concoction. To the second, which is busied either in refining the good nourishment or expelling the bad, is chiefly belonging the liver, like in colour to congealed blood, the shop of blood, situate in the right hypochondry, in figure like to a half-moon, _generosum membrum_ Melancthon styles it, a generous part; it serves to turn the chylus to blood, for the nourishment of the body. The excrements of it are either choleric or watery, which the other subordinate parts convey. The gall placed in the concave of the liver, extracts choler to it: the spleen, melancholy; which is situate on the left side, over against the liver, a spongy matter, that draws this black choler to it by a secret virtue, and feeds upon it, conveying the rest to the bottom of the stomach, to stir up appet.i.te, or else to the guts as an excrement. That watery matter the two kidneys expurgate by those emulgent veins and ureters. The emulgent draw this superfluous moisture from the blood; the two ureters convey it to the bladder, which, by reason of his site in the lower belly, is apt to receive it, having two parts, neck and bottom: the bottom holds the water, the neck is constringed with a muscle, which, as a porter, keeps the water from running out against our will.

Members of generation are common to both s.e.xes, or peculiar to one; which, because they are impertinent to my purpose, I do voluntarily omit.

_Middle Region_.] Next in order is the middle region, or chest, which comprehends the vital faculties and parts; which (as I have said) is separated from the lower belly by the diaphragma or midriff, which is a skin consisting of many nerves, membranes; and amongst other uses it hath, is the instrument of laughing. There is also a certain thin membrane, full of sinews, which covereth the whole chest within, and is called pleura, the seat of the disease called pleurisy, when it is inflamed; some add a third skin, which is termed mediastinus, which divides the chest into two parts, right and left; of this region the princ.i.p.al part is the heart, which is the seat and fountain of life, of heat, of spirits, of pulse and respiration--the sun of our body, the king and sole commander of it--the seat and organ of all pa.s.sions and affections. _Primum vivens, ultimum moriens_, it lives first, dies last in all creatures. Of a pyramidical form, and not much unlike to a pineapple; a part worthy of [964]

admiration, that can yield such variety of affections, by whose motion it is dilated or contracted, to stir and command the humours in the body. As in sorrow, melancholy; in anger, choler; in joy, to send the blood outwardly; in sorrow, to call it in; moving the humours, as horses do a chariot. This heart, though it be one sole member, yet it may be divided into two creeks right and left. The right is like the moon increasing, bigger than the other part, and receives blood from _vena cava_, distributing some of it to the lungs to nourish them; the rest to the left side, to engender spirits. The left creek hath the form of a cone, and is the seat of life, which, as a torch doth oil, draws blood unto it, begetting of it spirits and fire; and as fire in a torch, so are spirits in the blood; and by that great artery called aorta, it sends vital spirits over the body, and takes air from the lungs by that artery which is called _venosa_; so that both creeks have their vessels, the right two veins, the left two arteries, besides those two common anfractuous ears, which serve them both; the one to hold blood, the other air, for several uses. The lungs is a thin spongy part, like an ox hoof, (saith [965]Fernelius) the town-clerk or crier, ([966]one terms it) the instrument of voice, as an orator to a king; annexed to the heart, to express their thoughts by voice.

That it is the instrument of voice, is manifest, in that no creature can speak, or utter any voice, which wanteth these lights. It is, besides, the instrument of respiration, or breathing; and its office is to cool the heart, by sending air unto it, by the venosal artery, which vein comes to the lungs by that _aspera arteria_ which consists of many gristles, membranes, nerves, taking in air at the nose and mouth, and by it likewise exhales the fumes of the heart.

In the upper region serving the animal faculties, the chief organ is the brain, which is a soft, marrowish, and white substance, engendered of the purest part of seed and spirits, included by many skins, and seated within the skull or brain pan; and it is the most n.o.ble organ under heaven, the dwelling-house and seat of the soul, the habitation of wisdom, memory, judgment, reason, and in which man is most like unto G.o.d; and therefore nature hath covered it with a skull of hard bone, and two skins or membranes, whereof the one is called _dura mater_, or meninx, the other _pia mater_. The dura mater is next to the skull, above the other, which includes and protects the brain. When this is taken away, the pia mater is to be seen, a thin membrane, the next and immediate cover of the brain, and not covering only, but entering into it. The brain itself is divided into two parts, the fore and hinder part; the fore part is much bigger than the other, which is called the little brain in respect of it. This fore part hath many concavities distinguished by certain ventricles, which are the receptacles of the spirits, brought hither by the arteries from the heart, and are there refined to a more heavenly nature, to perform the actions of the soul. Of these ventricles there are three--right, left, and middle. The right and left answer to their site, and beget animal spirits; if they be any way hurt, sense and motion ceaseth. These ventricles, moreover, are held to be the seat of the common sense. The middle ventricle is a common concourse and cavity of them both, and hath two pa.s.sages--the one to receive pituita, and the other extends itself to the fourth creek; in this they place imagination and cogitation, and so the three ventricles of the fore part of the brain are used. The fourth creek behind the head is common to the cerebel or little brain, and marrow of the backbone, the last and most solid of all the rest, which receives the animal spirits from the other ventricles, and conveys them to the marrow in the back, and is the place where they say the memory is seated.

SUBSECT. V.--_Of the Soul and her Faculties_.

According to [967]Aristotle, the soul is defined to be [Greek: entelecheia], _perfectio et actus primus corporis organici, vitam habentis in potentia_: the perfection or first act of an organical body, having power of life, which most [968]philosophers approve. But many doubts arise about the essence, subject, seat, distinction, and subordinate faculties of it. For the essence and particular knowledge, of all other things it is most hard (be it of man or beast) to discern, as [969]Aristotle himself, [970]Tully, [971]Picus Mirandula, [972]Tolet, and other neoteric philosophers confess:--[973]"We can understand all things by her, but what she is we cannot apprehend." Some therefore make one soul, divided into three princ.i.p.al faculties; others, three distinct souls. Which question of late hath been much controverted by Picolomineus and Zabarel. [974]

Paracelsus will have four souls, adding to the three grand faculties a spiritual soul: which opinion of his, Campanella, in his book _de sensu rerum_ [975]much labours to demonstrate and prove, because carca.s.ses bleed at the sight of the murderer; with many such arguments And [976]some again, one soul of all creatures whatsoever, differing only in organs; and that beasts have reason as well as men, though, for some defect of organs, not in such measure. Others make a doubt whether it be all in all, and all in every part; which is amply discussed in Zabarel amongst the rest. The [977]common division of the soul is into three princ.i.p.al faculties--vegetal, sensitive, and rational, which make three distinct kinds of living creatures--vegetal plants, sensible beasts, rational men.

How these three princ.i.p.al faculties are distinguished and connected, _Humano ingenio inaccessum videtur_, is beyond human capacity, as [978]

Taurellus, Philip, Flavins, and others suppose. The inferior may be alone, but the superior cannot subsist without the other; so sensible includes vegetal, rational both; which are contained in it (saith Aristotle) _ut trigonus in tetragono_ as a triangle in a quadrangle.

_Vegetal Soul_.] Vegetal, the first of the three distinct faculties, is defined to be "a substantial act of an organical body, by which it is nourished, augmented, and begets another like unto itself." In which definition, three several operations are specified--altrix, auctrix, procreatrix; the first is [979]nutrition, whose object is nourishment, meat, drink, and the like; his organ the liver in sensible creatures; in plants, the root or sap. His office is to turn the nutriment into the substance of the body nourished, which he performs by natural heat. This nutritive operation hath four other subordinate functions or powers belonging to it--attraction, retention, digestion, expulsion.

_Attraction_.] [980]Attraction is a ministering faculty, which, as a loadstone doth iron, draws meat into the stomach, or as a lamp doth oil; and this attractive power is very necessary in plants, which suck up moisture by the root, as, another mouth, into the sap, as a like stomach.

_Retention_.] Retention keeps it, being attracted unto the stomach, until such time it be concocted; for if it should pa.s.s away straight, the body could not be nourished.

_Digestion_.] Digestion is performed by natural heat; for as the flame of a torch consumes oil, wax, tallow, so doth it alter and digest the nutritive matter. Indigestion is opposite unto it, for want of natural heat. Of this digestion there be three differences--maturation, elixation, a.s.sation.

_Maturation_.] Maturation is especially observed in the fruits of trees; which are then said to be ripe, when the seeds are fit to be sown again.

Crudity is opposed to it, which gluttons, epicures, and idle persons are most subject unto, that use no exercise to stir natural heat, or else choke it, as too much wood puts out a fire.

_Elixation_.] Elixation is the seething of meat in the stomach, by the said natural heat, as meat is boiled in a pot; to which corruption or putrefaction is opposite.

_a.s.sation_.] a.s.sation is a concoction of the inward moisture by heat; his opposite is semiustulation.

_Order of Concoction fourfold_.] Besides these three several operations of digestion, there is a fourfold order of concoction:--mastication, or chewing in the mouth; chilification of this so chewed meat in the stomach; the third is in the liver, to turn this chylus into blood, called sanguification; the last is a.s.similation, which is in every part.

_Expulsion_.] Expulsion is a power of nutrition, by which it expels all superfluous excrements, and relics of meat and drink, by the guts, bladder, pores; as by purging, vomiting, spitting, sweating, urine, hairs, nails, &c.

_Augmentation_.] As this nutritive faculty serves to nourish the body, so doth the augmenting faculty (the second operation or power of the vegetal faculty) to the increasing of it in quant.i.ty, according to all dimensions, long, broad, thick, and to make it grow till it come to his due proportion and perfect shape; which hath his period of augmentation, as of consumption; and that most certain, as the poet observes:--

"Stat sua cuique dies, breve et irreparabile tempus Omnibus est vitae."------

"A term of life is set to every man, Which is but short, and pa.s.s it no one can."

_Generation_.] The last of these vegetal faculties is generation, which begets another by means of seed, like unto itself, to the perpetual preservation of the species. To this faculty they ascribe three subordinate operations:--the first to turn nourishment into seed, &c.

_Life and Death concomitants of the Vegetal Faculties_.] Necessary concomitants or affections of this vegetal faculty are life and his privation, death. To the preservation of life the natural heat is most requisite, though siccity and humidity, and those first qualities, be not excluded. This heat is likewise in plants, as appears by their increasing, fructifying, &c., though not so easily perceived. In all bodies it must have radical [981]moisture to preserve it, that it be not consumed; to which preservation our clime, country, temperature, and the good or bad use of those six non-natural things avail much. For as this natural heat and moisture decays, so doth our life itself; and if not prevented before by some violent accident, or interrupted through our own default, is in the end dried up by old age, and extinguished by death for want of matter, as a lamp for defect of oil to maintain it.

SUBSECT. VI.--_Of the sensible Soul_.

Next in order is the sensible faculty, which is as far beyond the other in dignity, as a beast is preferred to a plant, having those vegetal powers included in it. 'Tis defined an "Act of an organical body by which it lives, hath sense, appet.i.te, judgment, breath, and motion." His object in general is a sensible or pa.s.sible quality, because the sense is affected with it. The general organ is the brain, from which princ.i.p.ally the sensible operations are derived. This sensible soul is divided into two parts, apprehending or moving. By the apprehensive power we perceive the species of sensible things present, or absent, and retain them as wax doth the print of a seal. By the moving, the body is outwardly carried from one place to another; or inwardly moved by spirits and pulse. The apprehensive faculty is subdivided into two parts, inward or outward. Outward, as the five senses, of touching, hearing, seeing, smelling, tasting, to which you may add Scaliger's sixth sense of t.i.tillation, if you please; or that of speech, which is the sixth external sense, according to Lullius. Inward are three--common sense, phantasy, memory. Those five outward senses have their object in outward things only, and such as are present, as the eye sees no colour except it be at hand, the ear sound. Three of these senses are of commodity, hearing, sight, and smell; two of necessity, touch, and taste, without which we cannot live. Besides, the sensitive power is active or pa.s.sive. Active in sight, the eye sees the colour; pa.s.sive when it is hurt by his object, as the eye by the sunbeams. According to that axiom, _visibile forte destruit sensum_. [982]Or if the object be not pleasing, as a bad sound to the ear, a stinking smell to the nose, &c.

_Sight_.] Of these five senses, sight is held to be most precious, and the best, and that by reason of his object, it sees the whole body at once. By it we learn, and discern all things, a sense most excellent for use: to the sight three things are required; the object, the organ, and the medium. The object in general is visible, or that which is to be seen, as colours, and all shining bodies. The medium is the illumination of the air, which comes from [983]light, commonly called diaphanum; for in dark we cannot see. The organ is the eye, and chiefly the apple of it, which by those optic nerves, concurring both in one, conveys the sight to the common sense. Between the organ and object a true distance is required, that it be not too near, or too far off! Many excellent questions appertain to this sense, discussed by philosophers: as whether this sight be caused _intra mittendo, vel extra mittendo_, &c., by receiving in the visible species, or sending of them out, which [984]Plato, [985]Plutarch, [986]Macrobius, [987]Lactantius and others dispute. And, besides, it is the subject of the perspectives, of which Alhazen the Arabian, Vitellio, Roger Bacon, Baptista Porta, Guidus Ubaldus, Aquilonius, &c., have written whole volumes.

_Hearing_.] Hearing, a most excellent outward sense, "by which we learn and get knowledge." His object is sound, or that which is heard; the medium, air; organ, the ear. To the sound, which is a collision of the air, three things are required; a body to strike, as the hand of a musician; the body struck, which must be solid and able to resist; as a bell, lute-string, not wool, or sponge; the medium, the air; which is inward, or outward; the outward being struck or collided by a solid body, still strikes the next air, until it come to that inward natural air, which as an exquisite organ is contained in a little skin formed like a drum-head, and struck upon by certain small instruments like drum-sticks, conveys the sound by a pair of nerves, appropriated to that use, to the common sense, as to a judge of sounds. There is great variety and much delight in them; for the knowledge of which, consult with Boethius and other musicians.

_Smelling_.] Smelling is an "outward sense, which apprehends by the nostrils drawing in air;" and of all the rest it is the weakest sense in men. The organ in the nose, or two small hollow pieces of flesh a little above it: the medium the air to men, as water to fish: the object, smell, arising from a mixed body resolved, which, whether it be a quality, fume, vapour, or exhalation, I will not now dispute, or of their differences, and how they are caused. This sense is an organ of health, as sight and hearing, saith [988]Agellius, are of discipline; and that by avoiding bad smells, as by choosing good, which do as much alter and affect the body many times, as diet itself.

_Taste_.] Taste, a necessary sense, "which perceives all savours by the tongue and palate, and that by means of a thin spittle, or watery juice."

His organ is the tongue with his tasting nerves; the medium, a watery juice; the object, taste, or savour, which is a quality in the juice, arising from the mixture of things tasted. Some make eight species or kinds of savour, bitter, sweet, sharp, salt, &c., all which sick men (as in an ague) cannot discern, by reason of their organs misaffected.

_Touching_.] Touch, the last of the senses, and most ign.o.ble, yet of as great necessity as the other, and of as much pleasure. This sense is exquisite in men, and by his nerves dispersed all over the body, perceives any tactile quality. His organ the nerves; his object those first qualities, hot, dry, moist, cold; and those that follow them, hard, soft, thick, thin, &c. Many delightsome questions are moved by philosophers about these five senses; their organs, objects, mediums, which for brevity I omit.

SUBSECT. VII.--_Of the Inward Senses._

_Common Sense_.] Inner senses are three in number, so called, because they be within the brainpan, as common sense, phantasy, memory. Their objects are not only things present, but they perceive the sensible species of things to come, past, absent, such as were before in the sense. This common sense is the judge or moderator of the rest, by whom we discern all differences of objects; for by mine eye I do not know that I see, or by mine ear that I hear, but by my common sense, who judgeth of sounds and colours: they are but the organs to bring the species to be censured; so that all their objects are his, and all their offices are his. The fore part of the brain is his organ or seat.

_Phantasy_.] Phantasy, or imagination, which some call estimative, or cogitative, (confirmed, saith [989]Fernelius, by frequent meditation,) is an inner sense which doth more fully examine the species perceived by common sense, of things present or absent, and keeps them longer, recalling them to mind again, or making new of his own. In time of sleep this faculty is free, and many times conceive strange, stupend, absurd shapes, as in sick men we commonly observe. His organ is the middle cell of the brain; his objects all the species communicated to him by the common sense, by comparison of which he feigns infinite other unto himself. In melancholy men this faculty is most powerful and strong, and often hurts, producing many monstrous and prodigious things, especially if it be stirred up by some terrible object, presented to it from common sense or memory. In poets and painters imagination forcibly works, as appears by their several fictions, antics, images: as Ovid's house of sleep, Psyche's palace in Apuleius, &c. In men it is subject and governed by reason, or at least should be; but in brutes it hath no superior, and is _ratio brutorum_, all the reason they have.

_Memory_.] Memory lays up all the species which the senses have brought in, and records them as a good register, that they may be forthcoming when they are called for by phantasy and reason. His object is the same with phantasy, his seat and organ the back part of the brain.

_Affections of the Senses, sleep and waking._] The affections of these senses are sleep and waking, common to all sensible creatures. "Sleep is a rest or binding of the outward senses, and of the common sense, for the preservation of body and soul" (as Scaliger [990]defines it); for when the common sense resteth, the outward senses rest also. The phantasy alone is free, and his commander reason: as appears by those imaginary dreams, which are of divers kinds, natural, divine, demoniacal, &c., which vary according to humours, diet, actions, objects, &c., of which Artemidorus, Carda.n.u.s, and Sambucus, with their several interpretators, have written great volumes. This litigation of senses proceeds from an inhibition of spirits, the way being stopped by which they should come; this stopping is caused of vapours arising out of the stomach, filling the nerves, by which the spirits should be conveyed. When these vapours are spent, the pa.s.sage is open, and the spirits perform their accustomed duties: so that "waking is the action and motion of the senses, which the spirits dispersed over all parts cause."

SUBSECT. VIII.--_Of the Moving Faculty_.