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 of their senses? The only suggestion in this direction comes from Mortimer Tregennis himself, who says that his brother spoke about some movement in the garden. That is certainly remarkable, as the night was rainy, cloudy, and dark. Anyone who had the design to alarm these people would be compelled to place his very face against the glass before he could be seen. There is a three-foot flower-border outside this window, but no indication of a footmark. It is difficult to imagine, then, how an outsider could have made so terrible an impression upon the company, nor have we found any possible motive for so strange and elaborate an attempt. You perceive our difficulties, Watson?”

“They are only too clear,” I answered, with conviction.

“And yet, with a little more material, we may prove that they are not insurmountable,” said Holmes. “I fancy that among your extensive archives, Watson, you may find some which were nearly as obscure. Meanwhile, we shall put the case aside until more accurate data are available, and devote the rest of our morning to the pursuit of neolithic man.”

I may have commented upon my friend’s power of mental detachment, but never have I wondered at it more than upon that spring morning in Cornwall when for two hours he discoursed upon celts, arrowheads, and shards, as lightly as