At all the lectures it was the duty of the beadle and his assistant to occupy a convenient post, in view of the whole auditory, so that he could mark the individual attendance and detect those engaged in larking during the progress of the lecture. Under such circumstances it was a task to the ingenuity of the boys to let off crackers without detection, or shy potatoes and cabbages at the botany lecturer for purposes of classification. The pundits themselves usually took the interruptions in a good-humoured way, doubtless reflecting that medical science has, from immemorial time, been imparted—in the British Isles, at least—under similar difficult conditions; so these being recognised _as_ conditions, they had to yield to the inevitable with the best grace they might. But as they looked to the beadle to keep order by means they knew him to possess, it was incumbent on Mr. Horne, now and then, to “espy” somebody, usually one out of favour with him temporarily, either from being deep in his debt or from having wounded his dignity. When a scape-goat or two had been thus caught, they had to pass an unpleasant quarter of an hour in the private room of the warden, and give assurances of better behaviour under threats of expulsion or suspension of schedules. The patience of the lecturers was admirable; they bore most interruptions with exemplary meekness, but they always resented pea-shooting as disturbing to the exact thinking and speaking necessary in treating scientific subjects. The botany lecturer, indeed, was a pattern of amiability. Not even a potato plump against his snowy shirt front, or a cabbage flop on his manuscript, disturbed him much or drove him into strong language. “Ah, thanks! yes, my young friend, that tuber is the _Solanum tuberosum_; it is a good specimen, but a little out of order. We have not yet reached the _Solanaceæ_. Will the young gentleman who has thus rather roughly drawn my attention to his specimen kindly tell me the characteristics of that order, and name the principal medicinal plants belonging to it? You, sir, I think it was, who forwarded me the example; Mr.——, Mr.——, your name escapes me for the moment. I mean the gentleman with an ecchymosis under his left eye.” The gentleman with the ecchymosis knew as much about the order in question as his bull terrier knew of astronomy; and amid the uproarious laughter of his class-mates, ever ready for a diversion of interest, on being pressed by the lecturer to exhibit his knowledge of the potato tribe, was fain to confess that he knew little more about the species than he saw of them on the dinner-table. He began to wish he had not thrown that tuber, and the laugh was well turned against him as the lecturer scored several neat points in dealing with him. This was one of the recognised and old-established methods of defence adopted by the persecuted teachers, and a good example of the survival of the fittest theory. The chair