will, on closer and more rational examination, be found to be nothing but the pedagogical effects of early environment. Professor Poulton, of Oxford, who has made many experiments on just-born birds, says that young chicks learn to fear the hawk and to interpret the oral warnings of the mother. Cats teach their young to play with their prey in that cruel manner so characteristic of all the Felidae, as I have myself observed more than once. A mother cat will carry a live mouse into the presence of her kittens and lie down and play with it, tossing it playfully into the air, poking it with her paw when it does not move, and arresting it when it starts to run away, the kittens all the time looking on, but never once attempting to take the mouse. After awhile the mother hands the captive over to the kittens, who go through the same performance one after another. After they have practised on it until the unfortunate creature is almost dead, the old cat will probably walk over to where the mouse is and eat it up. The whole thing is a _school_. The mouse is obviously not intended as food for the young, but to be used simply to impart instruction to them. ‘In popular writings and lectures some or all of the following activities of ant-life are commonly ascribed to instinct: The recognition of members of the same nest; powers of communication; keeping aphides for the sake of their sweet secretions; collection of aphid eggs in October, hatching them out in the nest, and taking them in the spring to the daisies on which they feed, for pasture; slave-making and slave-keeping, which, in some cases, is so ancient a habit that the enslavers are unable even to feed themselves; keeping insects as beasts of burden—_e.g._ a kind of plant-bug to carry leaves; keeping beetles, etc., as domestic pets; habits of personal cleanliness—one ant giving another a brush-up, and being, brushed up in return; habits of play and recreation; habits of burying their dead; the storage of grain and nipping the budding rootlet to prevent further germination; the habit of Texan ants of preparing a clearing around their nest, and, six months later, harvesting the ant-rice—a kind of grass of which they are particularly fond—even seeking and sowing the grain which shall yield the harvest; the collection by other ants of grass to manure the soil, on which there grows a species of fungus upon which they feed; the military organisation of the ecitons of Central America; and so forth. But to class all of these activities of the ant as illustrations of instinct is a survival of an old-fashioned method of treatment.