As comparative psychology is the youngest branch of philosophy, there are still among us thousands of excellent but ignorant folks who cling to the old mythologic notion that animals are animated machines or things “which” are devoid of intellect and feeling, and guided by a metaphysical fetish called “instinct.” To such the undertaking of a search for Love—real Romantic Love—among animals, will seem not only absurd, but a sort of high treason against human conceit. To mitigate any possible indignation on the reader’s part, it may be advisable, therefore, to begin by giving a few illustrations demonstrating the existence of various family affections and friendship in the animal world; after which, the possibility of finding traces of Love proper will appear less remote. _Paternal, filial, brotherly, and sisterly_ love, comparatively weak and undeveloped in man, are indeed almost absent in the lower animals. Birds of the same brood do not recognise each other after they have left their nest; and a dog will not hesitate to attack his own brother as a stranger after a year’s separation. The part which a male bird takes in feeding and protecting the young is, as Horwicz suggests, an element of his conjugal rather than his paternal feeling; and a young animal that would risk its own life in defence of its mother or father is yet to be heard from. _Friendship_, however, does exist between animals, as we have already seen; and not only among animals of the same species, but of different species. “Happy families” of animals commonly hostile to each other have been known outside of the showman’s cage. Büchner cites instances of friendship between a robin and a cat; a fox and duck; dog and deer; cat and mouse; and even such absurdly incongruous cases of attachment as between a crow and a bull; a dog and an elephant; a cat and a rattlesnake. But the deepest feeling of friendship which any animal is capable of feeling is undoubtedly the dog’s love of his master. “Professor Braubach,” says Darwin, “goes so far as to maintain that a dog looks on his master as on a god.” “It is said,” he adds in a footnote, “that Bacon long ago, and the poet Burns, held the same notion.”