Then occurred something that even those already used to that wild morning had not anticipated or dreamed. The professor, on finding Basil in front of him, stared with a blank benignity for a few seconds, and then drew up his left leg and hung it bent in the attitude that his sister had described as being the first of all his antics. And the moment he had done it Basil Grant lifted his own leg and held it out rigid before him, confronting Chadd with the flat sole of his boot. The professor dropped his bent leg, and swinging his weight on to it kicked out the other behind, like a man swimming. Basil crossed his feet like a saltire cross, and then flung them apart again, giving a leap into the air. Then before any of the spectators could say a word or even entertain a thought about the matter, both of them were dancing a sort of jig or hornpipe opposite each other; and the sun shone down on two madmen instead of one. They were so stricken with the deafness and blindness of monomania that they did not see the eldest Miss Chadd come out feverishly into the garden with gestures of entreaty, a gentleman following her. Professor Chadd was in the wildest posture of a pas-de-quatre, Basil Grant seemed about to turn a cart-wheel, when they were frozen in their follies by the steely voice of Adelaide Chadd saying, “Mr Bingham of the British Museum.” Mr Bingham was a slim, well-clad gentleman with a pointed and slightly effeminate grey beard, unimpeachable gloves, and formal but agreeable manners. He was the type of the over-civilized, as Professor Chadd was of the uncivilized pedant. His formality and agreeableness did him some credit under the circumstances. He had a vast experience of books and a considerable experience of the more dilettante fashionable salons. But neither branch of knowledge had accustomed him to the spectacle of two grey-haired middle-class gentlemen in modern costume throwing themselves about like acrobats as a substitute for an after-dinner nap. The professor continued his antics with perfect placidity, but Grant stopped abruptly. The doctor had reappeared on the scene, and his shiny black eyes, under his shiny black hat, moved restlessly from one of them to the other. “Dr Colman,” said Basil, turning to him, “will you entertain Professor Chadd again for a little while? I am sure that he needs you. Mr Bingham, might I have the pleasure of a few moments' private conversation? My name is Grant.” Mr Bingham, of the British Museum, bowed in a manner that was respectful but a trifle bewildered. “Miss Chadd will excuse me,” continued Basil easily, “if I know my way about the house.” And he led the dazed librarian rapidly through the back door into the parlour. “Mr Bingham,” said Basil, setting a chair for him, “I imagine that Miss Chadd has told you of this distressing occurrence.”