He understood perfectly and knew that his mother's request was reasonable, so had contented himself by offering to help out at the Association in Mr. Allen's absence. He was anxious to give something in return for all Mr. Allen was giving him. Then, too, it gave him an opportunity to watch the development of a good many of the cocoons and chrysalides that the nature study club had placed in glasses in a window of the reading room. He had been making sketches of the development of several butterflies. This kind of work he dearly loved. He would spend hours, sometimes, watching a delicate insect emerge from its cocoon and slowly dry its dainty, crumpled wings until it was able to fly. One day he sat sketching an immense Ichneumon fly that had just emerged from a Tawny Admiral chrysalis. "You can't always tell," he was saying to the little group that were watching him. "Nature fools you sometimes. Mr. Caterpillar, who built that clean, cozy little house, and he was a fine, big, healthy fellow, too, expected to be somebody one of these days--a beautiful butterfly like the frontispiece of that nature book--but he got into bad company and got 'stung.' Now, instead of hatching a butterfly, out comes this robber fly, a long, lean, sleek-looking fellow that has been living for weeks on the body of that poor caterpillar, and we didn't know it. You want to watch out who you run with, fellows, or you're liable to turn out 'Ichneumon men' instead of gentlemen." He laughed as he returned the glass to the shelf and closed his sketch book. "What in the world!" "Pots and kettles, frying pans, French toast, hot cakes, Chef's the man; We'll wash our hair and comb our face, Camp Tech--ump--sa, that's the place." The crowd made a break for the door, and in a moment more they were inside, laughing and shouting. Five minutes later they might all have been found splashing around in the swimming-pool, making up for the lost swims of the past few days, their bodies brown as berries, and as healthy as free, camp-life in mountain air could make them. Mr. Allen shook Willis by the hand. "I never had a better time in my life; and such a gang of royal good fellows! Willis, old man, I always want to be a boy if age takes such real pleasures away from man. I missed you, boy, every day, and needed you so often. How's the aunt, and how's the Department? Say, Willis, while I take a little swim, will you 'phone to all the Cabinet members and tell them it's Bruin Inn for supper on Saturday night?--a very important meeting! Meet here at five o'clock. And say, I want you to go along with us. I have decided to add an out-of-door committee to the Cabinet, and I want you to represent that phase of the work, will you?"