"Certainly. They were declared to be spurious."
"Exactly. Now that was all that I knew when you were here last except that the signatures seemed to be very similar. It was possible that they were tracings. The plain deduction from this was that the forger was some one in John Wood's establishment; some one who could have access to the checkbook, to the punch, and also have a chance to copy the signature, if it was copied."
"All that is quite clear, but how to proceed?"
"I instructed you to send me a list of all the checks which had been paid out on John Wood's account, giving their dates, numbers, and amounts. I also asked you to procure for me from the Harlem National Bank a similar list of checks paid on order of Carl Grasse. These two lists you sent to me, and they have been very useful. As soon as you left me, and whilst awaiting your lists, I tried some experiments with the forged checks. First I argued that if the signatures were traced, having been made, as it were, from a model, it would follow necessarily that they would exactly coincide if superimposed the one upon the other. Now whilst a man from habit will write his name very similarly a thousand times, I doubt if in a million times he would, or could, exactly reproduce his signature. The test of placing one over the other and examining with transmitted light satisfied me that they were not tracings. I compared each check with each of the others, and with the genuine one which you also left with me. No two were exact counterparts of one another. Still this did not completely prove that they were not tracings, for an artistic criminal might have gone so far as to trace each check from a different model, thus avoiding identity whilst preserving similarity."
"Mr. Barnes," said Mr. West, admiringly, "you delight me with your care in reasoning out your point."
"Mr. West, in speculating upon circumstantial evidence the most thorough care must be used, if one would avoid arresting the innocent. Nothing, to my mind, is stronger proof against a criminal than a complete chain of circumstantial evidence, but again, nothing is so misleading if at any stage a mistake, an omission, or a misconstruction be allowed to occur. In this case, then, as I was starting out to prove what was merely a suspicion, I determined to be most careful, for indeed I dislike following up suspicion at any time. A suspicion is a prejudgment, and may prove a hindrance to correct reasoning. Not entirely satisfied, therefore, I took the next step. A tracing can be made in either of two ways: with a lead-pencil, or with a stylus of glass or agate. The former leaves a deposit of the lead, whilst the latter makes an indentation upon the paper. In the first case the forger will attempt to remove the lead with an erasing rubber, but will not succeed thoroughly, because some of it will be covered by the ink, and because of the danger of injuring the surface of the paper. In the latter instance, if he be a very thoughtful man, he might undertake to remove the indentation by rubbing the opposite side with the end of his knife or with an ivory paper-cutter. In either case a careful scrutiny with a strong glass would show the burnishing upon the reverse side. I could find nothing of the sort. Taking one of the checks I applied a solution to remove the ink. A thorough examination disclosed that there was no sign either of the graphite, or of the indentation from the stylus. In fact, I became satisfied that the signatures had not been traced."
"But what did that prove? They might have been imitations made by a clever penman."
"They might have been, but I doubted it; and since you ask, I will give my reasons. In the first place, the signatures were accepted at your bank not once, but four times. It would be a remarkably clever man to deceive experts so well. However, I did not abandon this possibility until further developments showed conclusively to my mind that it would be a waste of time to follow up that line of research. Had it been necessary to do so, I should have discovered who in the place had the opportunity to do the work, and by examining their past I should have received a hint as to which of these was most likely to be my man. For any man who could have the ability to commit such a clever forgery must have acquired it as a sequence of special skill and aptitude with his pen of which his friends would be cognizant. Once I looked up such a man, and found that as a boy he had forged his parents' names to excuses for absences from school. Later he turned to higher things. In this instance I was satisfied that the only person having the access to materials, the knowledge of the financial condition of the concern, and the ability to write the checks, was Mr. John Wood himself."
"John Wood!" exclaimed the cashier. "Impossible! Why, that would mean that——"
"Nothing is impossible, Mr. West. I know what you would say. That it involved his having an accomplice in this Carl Grasse? Well, that is what I suspected, and that is why I asked for an additional reward for the recovery of the funds. If I could prove that John Wood made the checks himself, they ceased to be forgeries in one sense, and the bank could rightfully charge the amounts against his account. But let me tell you why I abandoned your theory that an expert penman was at work. Observe that though you would have honored a check for forty thousand dollars drawn by John Wood, yet the forgeries were four in number. That showed that the man was not afraid of arousing your suspicion. The only man who could feel absolutely sure upon that point was John Wood. But there is another pretty point. These checks being spurious, and yet being numbered, could arouse your suspicion in two ways. If the numbers upon them greatly varied from those upon genuine checks coming in at the same time, the fraud would have been detected quickly. On the other hand, he could not give you correct numbers without being either in collusion with his bookkeeper or else duplicating the numbering of other checks. That the latter course was pursued, exempted the bookkeeper. All the numbers on the forged checks were duplicates of those on genuine ones."