The man who drew the chalk-line would then, as explained in the previous chapter, hide some small item near the end of the line, and then, following behind me at a distance of three or four paces, he would “will” me to go forward along the line, following all its twisting and turnings, until I had reached the end of it and retrieved the hidden article. My great aim and object in carrying out these tests was to impress upon this individual that it was he who was really doing the finding through me, that I was only the medium, so to speak, and that it was his will-power that set me in motion and directed me which way to go.

In order to encourage this delusion I used to tell him beforehand to draw crosses here and there along the line, explaining that, if he succeeded in exercising sufficient will-power, I would stop at each cross to it. This invariably greatly impressed the beholders, and added considerably to their mystification.

The reader will now be able to form a fairly clear idea of how this particular trick was worked, bearing in mind my previous explanation as regards the bandaging, and the contraction and expansion at will of the artificially developed frontal muscles. I forgot to say that in addition to the bandage, folded in many thicknesses, I used to insist, as an extra precaution, on my eyes being covered with pads of cotton-wool. This, however, made no difference. Nature has fortunately endowed me with a fairly prominent nose, and by expanding the bandage and pads, and shifting their position ever so slightly by muscular effort in the manner already described, I was easily able to see down each side of it.

True, the range of vision so obtained was extremely limited. I could see no more than a few inches immediately in front of me. But the chalk-line was there. I had only to keep along it, stop at the various cross marks, and, when I came to the end of it, grope about for the hidden article until I found it—no very difficult task. In fact, it was no more than a cause of following my nose, literally as well as metaphorically.

Of course, there was a good deal of play-acting about the performance. I had to grope and stumble about, for instance, exactly as a blindfolded man would; and yet I had to be very careful not to overdo the part, for the great thing, of course, was to avoid rousing the slightest suspicion in the minds of the onlookers. As a matter of fact, I am quite convinced that none of them at any time harboured any such suspicions. The elaborately tight bandaging, the plugging of the eyes with pads of cotton-wool pressed well down into the sockets, was sufficient to convince the most sceptical. And, of course, they were quite right in assuming that I could not see at the time when they were examining me. It was afterwards, when the frontal muscular expansion came into play, and I made ready to start on my quest, that the element of sight came into operation.

This preliminary test, with the chalk line to guide me, was, however, a comparatively simple matter. It was far otherwise when it came to working the trick in the open streets, without any line, or in fact guidance of any sort, save that which was supposed to come from the man walking behind me, who, moreover, was forbidden to speak to me, and who, of course, was not in personal contact with me in any shape or form.

During the months in which I was engaged in working the trick out in my own mind, and in experimenting privately as regards the best way of successfully concluding the task I had set myself, I found that the only moving objects that were at all likely to come within the extremely limited range of vision allowed me when “blindfolded” were—boots.

Forthwith I became an enthusiastic and critical student of boots of all kinds. Not new boots as exhibited in the shop windows, be it understood; but worn boots—boots on people’s feet. I practised my powers of observation on men I met, training my memory in this one direction until I was able mentally to visualize, so to speak, any pair of boots I had once seen. I could see in my mind’s eye every crease, each tiny protuberance. Sherlock Holmes himself would simply not have been in it with me in this particular branch of detective science. I learnt to recognise and know men by their boots, and by their boots alone. It was a most fascinating study, once I had warmed to my subject, and fraught with infinite possibilities. Some day I shall publish a monograph on “The Influence of Character on Footwear.”

Exactly how this laboriously acquired knowledge helped me in my quest for hidden treasure the reader shall now learn, and I will take as an illustration the test imposed upon me at Oakland, California, where two hundred and fifty dollars in gold was actually hidden. The reader will please imagine me at the office of the Tribune newspaper of that city. Outside in the street is an immense throng of curious people, for the affair has been well boomed beforehand. I am introduced to the person who is to “guide” me, and who alone of all those present knows where the treasure is hidden—in this case, Mr. A. A. Denison, of the Oakland Chamber of Commerce.

Prior to being blindfolded by the committee of prominent citizens appointed for the purpose, I am introduced to this gentleman, and we shake hands. Meanwhile I take stock of his boots, while addressing him in some such terms as these: “You will please understand, Mr. Denison, that my failure or success to-day in the task I have undertaken rests with you, and you alone. You are the active agent; I am merely the passive one. In effect it is you who are going to find this treasure, not I. You must exert all the strength of your will power to guide me aright. If you do this, I cannot possibly fail; if you fail to do it, I cannot succeed. Walk behind me, and will me along the right path. If I am going in the right direction, mentally boost me ahead. If I am going wrong, stop yourself and mentally tell me to stop also. This is all I ask—that you shall not will me along the wrong road.”