Gray dust and Trichinopoly

In one place he (Sherlock Holmes) gathered up very carefully a little pile of gray dust from the floor, and packed it away in an envelope.

"He (
Jefferson Hope) smoked a Trichinopoly cigar."

"I gathered up some scattered ash from the floor. It was dark in colour and flaky — such an ash 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." (
Sherlock Holmes)
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