The girl and her chaperon had been deposited early in the desirable second-story window in Durfee, looking down on the tree. Brant was a senior and a "Bones" man, and so had a leading part to play in the afternoon's drama. He must get the girl and the chaperon off his hands, and be at his business. This was "Tap Day." It is perhaps well to explain what "Tap Day" means; there are people who have not been at Yale or had sons or sweethearts there.