Since my conversation with Dr. Wallace we have had more of these strange narratives--the fables and ghost stories which the unbelievers are compelled in the end to accept--and all that Dr. Jenner or his assistant saw others have seen, and some observers have even taken snapshots of the young cuckoo in the act of ejecting his fellow-nestling. But it appears from all the accounts which I have so far read, that in every case the observer was impatient and interfered in the business by touching and irritating the young cuckoo, by putting eggs and other objects on his back, and by making other experiments. In the instance I am about to give there was no interference by me or by the others who at intervals watched with me. {15} [Sidenote: A cuckoo in a robin's nest] A robin's nest with three robin's eggs and one of the cuckoo was found in a low bank at the side of the small orchard on 19th May, 1900. The bird was incubating, and on the afternoon of 27th May the cuckoo hatched out. Unfortunately I did not know how long incubation had been going on before the 19th, but from the fact that the cuckoo was first out, it seems probable that the parasite has this further advantage of coming first from the shell. Long ago I found that this was so in the case of the parasitical troupials of the genus _Molothrus_ in South America. I kept a close watch on the nest for the rest of that afternoon and the whole of the following day (the 28th), during which the young cuckoo was lying in the bottom of the nest, helpless as a piece of jelly with a little life in it, and with just strength enough in his neck to lift his head and open his mouth; and then, after a second or two, the wavering head would drop again. At eight o'clock next morning (29th), I found that one robin had come out of the shell, and one egg had been ejected and was lying a few inches below the nest on the sloping bank. Yet the young cuckoo still appeared a weak, helpless, jelly-like creature, as on the previous day. But he had increased greatly in size. I believe that in forty-eight hours from the time of hatching he had quite doubled his bulk, and had grown darker, his naked skin being of a bluish-black colour. The robin, thirty or more hours younger, was little more than half his size, and had a pale, pinkish-yellow {16} skin, thinly clothed with a long black down. The cuckoo occupied the middle of the deep, cup-shaped nest, and his broad back, hollow in the middle, formed a sort of false bottom; but there was a small space between the bird's sides and the nest, and in this space or interstice the one unhatched egg that still remained and the young robin were lying.