Sir Arthur Conan Doyle: A Study in Scarlet

PART I. 4. CHAPTER IV. WHAT JOHN RANCE HAD TO TELL. (continued)

"Well, if a man can stride four and a-half feet without the smallest effort, he can't be quite in the sere and yellow. That was the breadth of a puddle on the garden walk which he had evidently walked across. Patent-leather boots had gone round, and Square-toes had hopped over. There is no mystery about it at all. I am simply applying to ordinary life a few of those precepts of observation and deduction which I advocated in that article. Is there anything else that puzzles you?"

"The finger nails and the Trichinopoly," I suggested.

"The writing on the wall was done with a man's forefinger dipped in blood. My glass allowed me to observe that the plaster was slightly scratched in doing it, which would not have been the case if the man's nail had been trimmed. I gathered up some scattered ash from the floor. It was dark in colour and flakey -- such an ash as is only made by a Trichinopoly. I have made a special study of cigar ashes -- in fact, I have written a monograph upon the subject. I flatter myself that I can distinguish at a glance the ash of any known brand, either of cigar or of tobacco. It is just in such details that the skilled detective differs from the Gregson and Lestrade type."

"And the florid face?" I asked.

"Ah, that was a more daring shot, though I have no doubt that I was right. You must not ask me that at the present state of the affair."

I passed my hand over my brow. "My head is in a whirl," I remarked; "the more one thinks of it the more mysterious it grows. How came these two men -- if there were two men -- into an empty house? What has become of the cabman who drove them? How could one man compel another to take poison? Where did the blood come from? What was the object of the murderer, since robbery had no part in it? How came the woman's ring there? Above all, why should the second man write up the German word RACHE before decamping? I confess that I cannot see any possible way of reconciling all these facts."