Mr. Rapp, who is drawing a little man out of dots and lines upon the margin of his “Quain’s Anatomy,” starts up, and observes—“Something about the Paddington Canal running round a corner, sir.”

“Now, Mr. Rapp, you must pay me a little more attention,” expostulates the teacher. “What does the operation for cataract resemble in a familiar point of view?”

“Pushing a boat-hook through the wall of a house to pull back the drawing-room blinds,” answers Mr. Rapp.

“You are incorrigible,” says the teacher, smiling at the simile, which altogether is an apt one. “Did you ever see a case of bad cataract?”

“Yes, sir, ever-so-long ago—the Cataract of the Ganges at Astley’s. I went to the gallery, and had a mill with—”

“There, we don’t want particulars,” interrupts the grinder; “but I would recommend you to mind your eyes, especially if you get under Guthrie. Mr. Muff, how do you define an ulcer?”

“The establishment of a raw,” replies Mr. Muff.

“Tit! tit! tit!” continues the teacher, with an expression of pity. “Mr. Simpson, perhaps you can tell Mr. Muff what an ulcer is?”

“An abrasion of the cuticle produced by its own absorption,” answers Mr. Simpson, all in a breath.

“Well. I maintain it’s easier to say a raw than all that,” observes Mr. Muff.