“That’s easy, because I only did it this morning. It was leg muscles.”

“Yes. Who was the subject?”

“An old woman of sorts; died of pneumonia.”

“Yes. Turn back the pages of your drawing book in your mind. What came before that?”

“Oh, some animals—still legs; I’m doing motor muscles at present. Yes. That was old Cunningham’s demonstration on comparative anatomy. I did rather a good thing of a hare’s legs and a frog’s, and rudimentary legs on a snake.”

“Yes. Which day does Mr. Cunningham lecture?”

“Friday.”

“Friday; yes. Turn back again. What comes before that?”

Mr. Piggott shook his head.

“Do your drawings of legs begin on the right-hand page or the left-hand page? Can you see the first drawing?”