"Now, you see what he has done—no doubt on the advice of some friendly hatter. He has bought a hat of a suitable size, and he has made it hot—probably steamed it. Then he has jammed it, while still hot and soft, on to his head, and allowed it to cool and set before removing it. That is evident from the distortion of the brim. The important corollary is, that this hat fits his head exactly—is, in fact, a perfect mould of it; and this fact, together with the cheap quality of the hat, furnishes the further corollary that it has probably only had a single owner.
"And now let us turn it over and look at the outside. You notice at once the absence of old dust. Allowing for the circumstance that it had been out all night, it is decidedly clean. Its owner has been in the habit of brushing it, and is therefore presumably a decent, orderly man. But if you look at it in a good light, you see a kind of bloom on the felt, and through this lens you can make out particles of a fine white powder which has worked into the surface."
He handed me his lens, through which I could distinctly see the particles to which he referred.
"Then," he continued, "under the curl of the brim and in the folds of the hatband, where the brush has not been able to reach it, the powder has collected quite thickly, and we can see that it is a very fine powder, and very white, like flour. What do you make of that?"
"I should say that it is connected with some industry. He may be engaged in some factory or works, or, at any rate, may live near a factory, and have to pass it frequently."
"Yes; and I think we can distinguish between the two possibilities. For, if he only passes the factory, the dust will be on the outside of the hat only; the inside will be protected by his head. But if he is engaged in the works, the dust will be inside, too, as the hat will hang on a peg in the dust-laden atmosphere, and his head will also be powdered, and so convey the dust to the inside."
He turned the hat over once more, and as I brought the powerful lens to bear upon the dark lining, I could clearly distinguish a number of white particles in the interstices of the fabric.
"The powder is on the inside, too," I said.
He took the lens from me, and, having verified my statement, proceeded with the examination. "You notice," he said, "that the leather head-lining is stained with grease, and this staining is more pronounced at the sides and back. His hair, therefore, is naturally greasy, or he greases it artificially; for if the staining were caused by perspiration, it would be most marked opposite the forehead."
He peered anxiously into the interior of the hat, and eventually turned down the head-lining; and immediately there broke out upon his face a gleam of satisfaction.