ends—a conscious, deliberate adaptation, not one due to accident only. No one would call an act done blindly a reasonable or intelligent action on the part of him who did it, however fortunate might be its result. Instinctive actions, then, hold a middle place between (1) those which are rational, or truly intelligent, and (2) those in which sensation has no place. But a great variety of actions of different kinds occupy this intermediate position, and we must next proceed to separate off from the others, such actions as may be deemed _truly_ instinctive. M. Albert Lemoine, who has written the best treatise[3] known to us on instinct and habit, distinguishes instinctive actions as those which are neither due to mechanical or chemical causes, nor to intelligence, experience, or will. They are actions which take place with a general fixity and precision, are generally present in all the individuals of each species, and can be perfectly performed the very first time their action is called for, so that they cannot be due to habit. Instinct, he very truly says, is more than a want and less than a desire. Instinct is a certain felt internal stimulus to definite actions which has its foundation in a certain sense of want, but is not definite feeling of want of the particular end to be attained. Were that recognised, it would not be _instinct_, but _desire_. It is but a vague craving to exercise certain activities the exercise of which conduces to useful or needful, but unforeseen, end. Instinct often sets in motion organs quite different from those which feel the prick of want, and which do not (experience apart) seem to have relation with it. Hunger does not stimulate to action the organs of digestion which suffer from it, but excites the limbs and jaws to perform acts by which food may be obtained and eaten. In examining into instinct, we must be careful not to omit the consideration of it as it exists in man, since we can know no creature so well as we can, by the help of language and reflection, know ourselves and our own species. Nevertheless, it may be well to begin by calling attention to certain apparently undeniable cases of instinct in other animals, since in them instinct is much more apparent and complex than in man, in whom it is indeed reduced to a minimum. It might naturally be expected to be so reduced in him—if it is a power serving to bridge over the gulf which exists between such almost mechanical action as reflex action, and true intelligence—since in man acts of intelligence, or habits originated through intelligence, come so constantly into play. But before enumerating cases of animal instinct, a word should be said as to one character which M. Lemoine attributes to instinctive action, namely, “consciousness,” This term is an exceedingly ambiguous one, as it is often referred, not only to our distinct intellectual perception of our own being and acts, but also to every state of feeling however rudimentary it may be. I