Long after I had tried to see things through Darwin's eyes I was perplexed by watching a cat trying to get the better of a sparrow in the garden. I noticed that every time it had crouched to make its pounce the cat waved its tail. Why on earth it should try to make itself conspicuous in this way when it was flattening itself into the earth that was nearest to it in colour, and writhing towards its prey, seemed to me remarkable. Once, however, I was able to watch the cat approach when I was seated beyond where the sparrow was digging up worms, and the cat had slipped among the lower boughs of an ash covered with trembling leaves. There among the trembling leaves I saw another trembling leaf--the soothing, swaying end of my cat's tail; but if I had not known that it was there I should not have noticed it apart from the moving leaves. The bird with all its vigilance was deceived, and it was in the cat's jaws in another moment. And I had been calling that cat--and, incidentally, Darwin--a fool for several years! I do not know what my Zoologist “for the Use of Schools” would have made of the transaction. Would he have said that a cat abhorred the sin of lying, and scorned to take advantage of the bird, but gave that graceful swing to its tail to make the bird aware of its menacing proximity? I lived for eleven years in a house in Kensington with quite a spacious garden behind it, and was blest for several years by the company of a pair of blackbirds that made their nest among the converging twigs of a high lilac. No cat could climb that tree in spring, as I perceived when I had watched the frustrated attempts of the splendid blue Persian who was my constant companion. Of course I lived in that garden for hours every day during the months of April, May, June, and July, and we guarded the nest very closely, even going so far as to disturb the balance of Nature by sending the cat away on a visit when the young birds were being fledged. But one month of May arrived, and though I noticed the parent blackbirds occasionally among the trees and shrubs, I never once saw them approaching the old nest, which, as in previous seasons, was smothered out of sight in the foliage about it, for a poplar towered above the lilac, and was well furnished. I remarked to my man that I was afraid our blackbirds had deserted us this year, and he agreed with me. But one day early in June I saw the cat look wistfully up the lilac. “He hasn't forgotten the nest that was there,” I said. “But I'm sure he'll find out in which of the neighbouring gardens the new one has been built.” But every day he came out and gazed up as if into the depths of the foliage above our heads. “Ornithology is his hobby,” said I, “but he's not so smart as I fancied, or he would be hustling around the other gardens where he should know murder can be done with impunity.”