"But see, now, the interesting corollary that follows from this. I, alone, suspect this person; therefore I have not published my suspicions, or others would suspect him too. Why, then, does he suspect me of suspecting him, since I have not spoken? Evidently, he too must be in possession of exclusive information. In other words, my suspicions are correct; for if they were not, he could not be aware of their existence.

"The next point is the selection of this rather unusual type of cigar. Why should he have sent a Trichinopoly instead of an ordinary Havana such as Bartletts actually manufacture? It looks as if he were aware of my peculiar predilection, and, by thus consulting my personal tastes, had guarded against the chance of my giving the cigar to some other person. We may, therefore, infer that our friend probably has some knowledge of my habits.

"The third point is, What is the social standing of this gentle stranger, whom we will call X? Now, Bartletts do not send their advertis.e.m.e.nts and samples to Thomas, Richard and Henry. They send, chiefly, to members of the professions and men of means and position. It is true that the original package might have been annexed by a clerk, office boy or domestic servant; but the probabilities are that X received the package himself, and this is borne out by the fact that he was able to obtain access to a powerful alkaloidal poison-such as this undoubtedly is."

"In that case he would probably be a medical man or a chemist," I suggested.

"Not necessarily," replied Thornd.y.k.e. "The laws relating to poisons are so badly framed and administered that any well-to-do person, who has the necessary knowledge, can obtain almost any poison that he wants. But social position is an important factor, whence we may conclude that X belongs, at least, to the middle cla.s.s.

"The fourth point relates to the personal qualities of X. Now it is evident, from this instance alone, that he is a man of exceptional intelligence, of considerable general information, and both ingenious and resourceful. This cigar device is not only clever and original, but it has been adapted to the special circ.u.mstances with remarkable forethought. Thus the cheroot was selected, apparently, for two excellent reasons: first, that it was the most likely form to be smoked by the person intended, and second, that it did not require to have the end cut off-which might have led to a discovery of the poison. The plan also shows a certain knowledge of chemistry; the poison was not intended merely to be dissolved in the moisture of the mouth. The idea evidently was that the steam generated by the combustion of the leaf at the distal end, would condense in the cooler part of the cigar and dissolve the poison, and the solution would then be drawn into the mouth. Then the nature of the poison and certain similarities of procedure seem to identify X with the cyclist who used that ingenious bullet. The poison in this case is a white, non-crystalline solid; the poison contained in the bullet was a solution of a white, non-crystalline solid, which a.n.a.lysis showed to be the most poisonous of all akaloids.

"The bullet was virtually a hypodermic syringe; the poison in this cigar has been introduced, in the form of an alcoholic or ethereal solution, by a hypodermic syringe. We shall thus be justified in a.s.suming that the bullet and the cigar came from the same person; and, if this be so, we may say that X is a person of considerable knowledge, of great ingenuity and no mean skill as a mechanician-as shown by the manufacture of the bullet.

"These are our princ.i.p.al facts-to which we may add the surmise that he has recently purchased a second-hand Blickensderfer of the literary form or, at least, fitted with a literary typewheel."

"I don't quite see how you arrive at that," I said, in some surprise.

"It is merely a guess, you know," he replied, "though a probable one. In the first place he is obviously unused to typing, as the numerous mistakes show; therefore he has not had the machine very long. The type is that which is peculiar to the Blickensderfer, and, in one of the mistakes, an asterisk has been printed in place of a letter. But the literary typewheel is the only one that has the asterisk. As to the age of the machine, there are evident signs of wear, for some of the letters have lost their sharpness, and this is most evident in the case of those letters which are the most used-the 'e,' you will notice, for instance, is much worn; and 'e' occurs more frequently than any other letter of the alphabet. Hence the machine, if recently purchased, was bought second-hand."

"But," I objected, "it may not have been his own machine at all."

"That is quite possible," answered Thornd.y.k.e, "though, considering the secrecy that would be necessary, the probabilities are in favour of his having bought it. But, in any case, we have here a means of identifying the machine, should we ever meet with it."

He picked up the label and handed it to me, together with his pocket lens.

"Look closely at the 'e' that we have been discussing; it occurs five times; in 'Thornd.y.k.e,' in 'Bench,' in 'Inner,' and in 'Temple.' Now in each case you will notice a minute break in the loop, just at the summit. That break corresponds to a tiny dent in the type-caused, probably, by its striking some small, hard object."

"I can make it out quite distinctly," I said, "and it should be a most valuable point for identification."

"It should be almost conclusive," Thornd.y.k.e replied, "especially when joined to other facts that would be elicited by a search of his premises. And now let us just recapitulate the facts which our friend X has placed at our disposal.

"First: X is a person concerning whom I possess certain exclusive information.

"Second: He has some knowledge of my personal habits.

"Third: He is a man of some means and social position.

"Fourth: He is a man of considerable knowledge, ingenuity and mechanical skill.

"Fifth: He has probably purchased, quite recently, a second-hand 'Blick' fitted with a literary typewheel.

"Sixth: That machine, whether his own or some other person's property, can be identified by a characteristic mark on the small 'e.'

"If you will note down those six points and add that X is probably an expert cyclist and a fairly good shot with a rifle, you may possibly be able, presently, to complete the equation, X = ?"

"I am afraid," I said, "I do not possess the necessary data; but I suspect you do, and if it is so, I repeat that it is your duty to society-to say nothing of your clients, whose interests would suffer by your death-to have this fellow laid by the heels before he does any mischief."

"Yes; I shall have to interfere if he becomes really troublesome, but I have reasons for wishing to leave him alone at present."

"You do really know who he is, then?"

"Well, I think I can solve the equation that I have just offered to you for solution. You see, I have certain data, as you suggest, which you do not possess. There is, for instance, a certain ingenious gentleman concerning whom I hold what I believe to be exclusive information, and my knowledge of him does not make it appear unlikely that he might be the author of these neat little plans."

"I am much impressed," I said, as I put away my notebook, after having jotted down the points that Thornd.y.k.e had advised me to consider-"I am much impressed by your powers of observation and your capacity for reasoning from apparently trivial data; but I do not see, even now, why you viewed that cigar with such immediate and decided suspicion. There was nothing actually to suggest the existence of poison in it, and yet you seemed to form the suspicion at once and to search for it as though you expected to find it."

"Yes," replied Thornd.y.k.e; "to a certain extent you are right. The idea of a poisoned cigar was not new to me-and thereby hangs a tale."

He laughed softly and gazed into the fire with eyes that twinkled with quiet amus.e.m.e.nt. "You have heard me say," he resumed, after a short pause, "that when I first took these chambers I had practically nothing to do. I had invented a new variety of medico-legal practice and had to build it up by slow degrees, and the natural consequence was that, for a long time, it yielded nothing but almost unlimited leisure. Now, that leisure was by no means wasted, for I employed it in considering the cla.s.s of cases in which I was likely to be employed, and in working out theoretical examples; and seeing that crimes against the person have nearly always a strong medical interest, I gave them special attention. For instance, I planned a series of murders, selecting royal personages and great ministers as the victims, and on each murder I brought to bear all the special knowledge, skill and ingenuity at my command. I inquired minutely into the habits of my hypothetical victims; ascertained who were their a.s.sociates, friends, enemies and servants; considered their diet, their residences, their modes of conveyance, the source of their clothing and, in fact, everything which it was necessary to know in order to achieve their deaths with certainty and with absolute safety to the murderer."

"How deeply gratified and flattered those great personages would have felt," I remarked, "if they had known how much attention they were receiving."

"Yes; I suppose it would have been somewhat startling, to the Prime Minister, for instance, to have learned that he was being watched and studied by an attentive observer and that the arrangements for his decease had been completed down to the minutest detail. But, of course, the application of the method to a particular case was the essential thing, for it brought into view all the incidental difficulties, in meeting which all the really interesting and instructive details were involved. Well, the particulars of these crimes I wrote out at length, in my private shorthand, in a journal which I kept for the purpose-and which, I need not say, I locked up securely in my safe when I was not using it. After completing each case, it was my custom to change sides and play the game over again from the opposite side of the board; that is to say, I added, as an appendix to each case, an a.n.a.lysis with a complete scheme for the detection of the crime. I have in my safe at the present moment six volumes of cases, fully indexed; and I can a.s.sure you that they are not only highly instructive reading, but are really valuable as works of reference."

"That I can readily believe," I replied, laughing heartily, nevertheless, at the grotesqueness of the whole proceeding, "though they might have proved rather incriminating doc.u.ments if they had pa.s.sed out of your possession."

"They would never have been read," rejoined Thornd.y.k.e. "My shorthand is, I think, quite undecipherable; it has been so made intentionally with a view to secrecy."

"And have any of your theoretical cases ever turned up in real life?"

"Several of them have, though very imperfectly planned and carried out as a rule. The poisoned cigar is one of them, though, of course I should never have adopted such a conspicuous device for presenting it; and the incident of the other night is a modification-for the worse-of another. In fact, most of the intricate and artistic crimes with which I have had to deal professionally have had their more complete and elaborate prototypes in my journals."

I was silent for some time, reflecting on the strange personality of my gifted friend and the singular fitness that he presented for the part he had chosen to play in the drama of social life; but presently my thoughts returned to the peril that overshadowed him, and I came back, once more, to my original question.

"And now, Thornd.y.k.e," I said, "that you have penetrated both the motives and the disguise of this villain, what are you going to do? Is he to be put safely under lock and key, or is he to be left in peace and security to plan some other, and perhaps more successful, scheme for your destruction?"

"For the present," replied Thornd.y.k.e, "I am going to put these things in a place of safety. To-morrow you shall come with me to the hospital and see me place the ends of the cigar in the custody of Dr. Chandler, who will make an a.n.a.lysis and report on the nature of the poison. After that we shall act in whatever way seems best."

Unsatisfactory as this conclusion appeared, I knew it was useless to raise further objections, and, accordingly, when the cigar with its accompanying papers and wrappings had been deposited in a drawer, we dismissed it, if not from our thoughts, at least from our conversation.

CHAPTER XIV

A STARTLING DISCOVERY

The morning of the trial, so long looked forward to, had at length arrived, and the train of events which it has been my business to chronicle in this narrative was now fast drawing to an end. To me those events had been in many ways of the deepest moment. Not only had they transported me from a life of monotonous drudgery into one charged with novelty and dramatic interest; not only had they introduced me to a renascence of scientific culture and revived under new conditions my intimacy with the comrade of my student days; but, far more momentous than any of these, they had given me the vision-all too fleeting-of happiness untold, with the reality of sorrow and bitter regret that promised to be all too enduring.

Whence it happened that on this morning my thoughts were tinged with a certain greyness. A chapter in my life that had been both bitter and sweet was closing, and already I saw myself once more an Ishmaelite and a wanderer among strangers.

This rather egotistical frame of mind, however, was soon dispelled when I encountered Polton, for the little man was in a veritable twitter of excitement at the prospect of witnessing the clearing up of the mysteries that had so severely tried his curiosity; and even Thornd.y.k.e, beneath his habitual calm, showed a trace of expectancy and pleasurable antic.i.p.ation.

"I have taken the liberty of making certain little arrangements on your behalf," he said, as we sat at breakfast, "of which I hope you will not disapprove. I have written to Mrs. Hornby, who is one of the witnesses, to say that you will meet her at Mr. Lawley's office and escort her and Miss Gibson to the court. Walter Hornby may be with them, and, if he is, you had better leave him, if possible, to come on with Lawley."