In fact it might almost be said that it began before the laying of the first egg, during the time they were "thinking" in the nest. (One wonders if this preliminary nest-sitting and changing of shifts may not have served as a training period during which incubation routine was standardized and systematized so that there might be no mistakes and misunderstandings when the time arrived to put it into effect seriously). At about noon, therefore, they completed the twelfth day of incubation, Mr. Brock says that the first egg laid should hatch, if incubation has been continuous, in the forenoon of the thirteenth day, and each following egg one day later. On this basis, one might reasonably expect one egg to hatch to- morrow. We shall see what we shall see. March 21st. At 7:45 Green-eyes on the nest, back and top of head all in a straight line; tail projecting upward at an angle of 45 degrees, looking very comfortable. Brown-eyes in the glade, as Julio said: "All mixed up with the quail." At nine o'clock Green-eyes was down in the chaparral on the bank, but would not come up on invitation, although he looked as if he wanted to. I went up to the nest and offered Brown-eyes a worm which she would not take. I pushed it against her bill, but she would only blink and look at me in a wooden sort of way. She did not cringe or manifest signs of fear or hostility. G.E. appeared in the glade below digging vigorously. Worms were dropped down to him hoping that he would bring one up to the nest for his mate and give me a chance to see whether there were any new developments without disturbing the occupant. For a time it seemed if this sys- tem would work, as he began to chirp and approached with a worm,only to swallow it. B.E. began to show interest in his movements and