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A professional case of great gravity was engaging my own

attention at the time, and the whole of next day I was busy at

the bedside of the sufferer. It was not until close upon six

o'clock that I found myself free and was able to spring into a

hansom and drive to Baker Street, half afraid that I might be too

late to assist at the denouement of the little mystery. I found

Sherlock Holmes alone, however, half asleep, with his long, thin

form curled up in the recesses of his armchair. A formidable

array of bottles and test-tubes, with the pungent cleanly smell

of hydrochloric acid, told me that he had spent his day in the

chemical work which was so dear to him.

"Well, have you solved it?" I asked as I entered.

"Yes. It was the bisulphate of baryta."

"No, no, the mystery!" I cried.