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.
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