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Rh in your line of business myself, but I believe it has even been used in the diamond trade."

"What do you mean?" asked Hamer, flushing angrily.

"Mean? Why, bless me—nothing more than I said. By the way, I'm afraid you dropped one of your medicine bottles last night. I've brought it back, though I'm afraid it's past repair. It's a good job you didn't quite clear the label off before you took it out with you, else I might have had a difficulty." Dorrington placed the fragments on the table. "You see you've just left the first letter of 'E.C.' in the druggist's address, and the last 'N' of Hatton Garden, just before it. There doesn't happen to be any other Garden in E.G. district that I know of, nor does the name of any other thoroughfare end in N—they are mostly streets, or lanes, or courts, you see. And there seems to be only one druggist in Hatton Garden—capital fellow, no doubt—the one whose name and address I observe on those bottles on the mantelpiece."

Dorrington stood with his foot on a chair, and tapped his knee carelessly with his stick. Hamer dropped into the other chair and regarded him with a frown, though his face was pale. Presently he said, in a strained voice, "Well?"