would therefore avoid the use of so equivocal a term, while fully admitting that no sensation in any animal is possible without some subjective psychical state analogous to what I have before denominated “consentience.” Now, as to the lower animals: birds unquestionably possess instinctive powers. Chickens, two minutes after they have left the egg,[4] will follow with their eyes the movements of crawling insects, and peck at them, judging distance and direction with almost infallible accuracy. They will instinctively appreciate sounds, readily running towards an invisible hen hidden in a box, when they hear her “call.” Some young birds, also, have an innate, instinctive horror of the sight of a hawk and of the sound of its voice. Swallows, titmice, tomtits, and wrens, after having been confined from birth, are capable of flying successfully at once, when liberated, on their wings having attained the necessary growth to render flight possible. The Duke of Argyll[5] relates some very interesting particulars about the instincts of birds, especially of the water ousel, the merganser, and the wild duck. Even as to the class of beasts I find recorded:[6] “Five young polecats were found comfortably embedded in dry withered grass; and in a side hole, of proper dimensions for such a larder, were forty frogs and two toads, all alive, but merely capable of sprawling a little. On examination the whole number, toads and all, proved to have been purposely and dexterously bitten through the brain.” Evidently the parent polecat had thus provided the young with food which could be kept perfectly fresh, because alive, and yet was rendered quite unable to escape. This singular instinct is like others which are yet more fully developed amongst insects—a class of animals the instincts of which are so numerous, wonderful, and notorious that it will be, probably, enough to refer to one or two examples. The female carpenter bee, in order to protect her eggs, excavates, in some piece of wood, a series of chambers, in special order with a view to a peculiar mode of exit for her young: but the young mother can have no conscious knowledge of the series of actions subsequently to ensue. The female of the wasp, _sphex_, affords another well-known but very remarkable example of a complex instinct closely related to that already mentioned in the case of the polecat. The female wasp has to provide fresh, living animal food for her progeny, which, when it quits its egg, quits it in the form of an almost helpless grub, utterly unable to catch, retain, or kill an active, struggling prey. Accordingly the mother insect has only to provide and place beside her eggs suitable living prey, but so to treat it that it may be a helpless, unresisting victim. That victim may be a mere caterpillar, or it may be a great, powerful grasshopper, or even that most fierce, active, and rapacious of insect tyrants, a fell and venomous spider. Whichever it may be, the