ORDO III.

_Retrograde a.s.sociate Motions._

GENUS I.

_Catenated with Irritative Motions._

SPECIES.

1. _Diabaetes irritata._ Diabetes from irritation.

2. _Sudor frigidus in asthmate._ Cold sweat in asthma.

3. _Diabaetes a timore._ Diabetes from fear.

4. _Diarrhoea a timore._ Diarrhoea from fear.

5. _Pallor et tremor a timore._ Paleness and trembling from fear.

6. _Palpitatio cordis a timore._ Palpitation of the heart from fear.

7. _Abortio a timore._ Abortion from fear.

8. _Hysteria a timore._ Hysterics from fear.

GENUS II.

_Catenated with Sensitive Motions._

SPECIES.

1. _Nausea idealis._ Nausea from ideas.

2. ---- _a conceptu._ Nausea from conception.

3. _Vomitio vertiginosa._ Vomiting from vertigo.

4. ---- _a calculo in uretere._ ---- from stone in the ureter.

5. ---- _ab insultu paralytico._ ---- from stroke of palsy.

6. ---- _a t.i.tilatione faucium._ ---- from tickling the throat.

7. ---- _cute sympathetica._ ---- from sympathy with the skin.

GENUS III.

_Catenated with Voluntary Motions._

SPECIES.

1. _Ruminatio._ Rumination.

2. _Vomitio voluntaria._ Voluntary vomiting.

3. _Eructatio voluntaria._ ---- eructation.

GENUS IV.

_Catenated with External Influences._

SPECIES.

1. _Catarrhus periodicus._ Periodical catarrh.

2. _Tussis periodica._ Periodic cough.

3. _Histeria a frigore._ Hysterics from cold.

4. _Nausea pluvialis._ Sickness against rain.

CLa.s.s IV.

DISEASES OF a.s.sOCIATION.

ORDO I.

_Increased a.s.sociate Motions._

GENUS I.

_Catenated with Irritative Motion._

The importance of the subsequent cla.s.s not only consists in its elucidating all the sympathetic diseases, but in its opening _a road to the knowledge of fever_. The difficulty and novelty of the subject must plead in excuse for the present imperfect state of it. The reader is entreated previously to attend to the following circ.u.mstances for the greater facility of investigating their intricate connections; which I shall enumerate under the following heads.

A. a.s.sociate motions distinguished from catenations.

B. a.s.sociate motions of three kinds.

C. a.s.sociations affected by external influences.

D. a.s.sociations affected by other sensorial motions.

E. a.s.sociations catenated with sensation.

F. Direct and reverse sympathy.

G. a.s.sociations affected four ways.

H. Origin of a.s.sociations.

I. Of the action of vomiting.

K. Tertian a.s.sociations.

A. _a.s.sociate Motions distinguished from Catenations._

a.s.sociate motions properly mean only those, which are caused by the sensorial power of a.s.sociation. Whence it appears, that those fibrous motions, which const.i.tute the introductory link of an a.s.sociate train of motions, are excluded from this definition, as not being themselves caused by the sensorial power of a.s.sociation, but by irritation, or sensation, or volition. I shall give for example the flushing of the face after dinner; the capillary vessels of the face increase their actions in consequence of their catenation, not their a.s.sociation, with those of the stomach; which latter are caused to act with greater energy by the irritation excited by the stimulus of food. These capillaries of the face are a.s.sociated with each other reciprocally, as being all of them excited by the sensorial power of a.s.sociation; but they are only catenated with those of the stomach, which are not in this case a.s.sociate motions but irritative ones.

The common use of the word a.s.sociation for almost every kind of connection has rendered this subject difficult; from which inaccuracy I fear some parts of this work are not exempt.

B. _a.s.sociate Motions of three Kinds._

Those trains or tribes of a.s.sociate motions, whose introductory link consists of an irritative motion, are termed irritative a.s.sociations; as when the muscles of the eyelids close the eye in common nict.i.tation. Those, whose introductory link consists of a sensitive motion, are termed sensitive a.s.sociations; as when the pectoral and intercostal muscles act in sneezing. And lastly, those, whose introductory link consists of a voluntary motion, are termed voluntary a.s.sociations; as when the muscles of the lower limbs act in concert with those of the arm in fencing.

C. _a.s.sociations affected by external Influences._

Circles of a.s.sociate motions, as well as trains and tribes of them, are liable to be affected by external influences, which consist of etherial fluids, and which, by penetrating the system, act upon it perhaps rather as a causa sine qua non of its movements, than directly as a stimulus; except when they are acc.u.mulated in unusual quant.i.ty. We have a sense adapted to the perception of the excess or defect of one of these fluids; I mean that of elementary heat; in which all things are immersed. See Cla.s.s IV. 1. 4.

7. But there are others of them, which as we have no power to evade their influence, so we have no sense to perceive it; these are the solar, and lunar, and terrestrial gravitation, in which also all things are immersed; the electric aura, which pervades us, and is perpetually varying, See Cla.s.s IV. 1. 4. 5; the magnetic fluid, Cla.s.s IV. 1. 4. 5; and lastly, the great life-preserver oxygen gas, and the aqueous vapour of the atmosphere, see Cla.s.s IV. 1. 4. 6. and 7. and 2.

Of these external influences those of heat, and of gravity, have diurnal periods of increase and decrease; besides their greater periods of monthly or annual variation. The manner in which they act by periodical increments on the system, till some effect is produced, is spoken of in Sect. x.x.xII.

3. and 6.

D. _a.s.sociations affected by other Sensorial Motions._