My consultation—it was a lunacy case of some importance—was over in time to allow of my return to our chambers punctually at the luncheon hour; and as I entered, I was at once struck by something new in Thorndyke's manner—a certain elation and gaiety which I had learned to associate with a point scored successfully in some intricate and puzzling case. He made no confidences, however, and seemed, in fact, inclined to put away, for a time, all his professional cares and business.
"Shall we have an afternoon off, Jervis?" he said gaily. "It is a fine day and work is slack just now. What say you to the Zoo? They have a splendid chimpanzee and several specimens of that remarkable fish Periophthalmos Kölreuteri. Shall we go?"
"By all means," I replied; "and we will mount the elephant, if you like, and throw buns to the grizzly bear and generally renew our youth like the eagle."
But when, an hour later, we found ourselves in the gardens, I began to suspect my friend of some ulterior purpose in this holiday jaunt; for it was not the chimpanzee or even the wonderful fish that attracted his attention. On the contrary, he hung about the vicinity of the lamas and camels in a way that I could not fail to notice; and even
