Yet habit does not, of itself, know, for it does not of itself stop to think, observe or remember. Neither does impulse of itself engage in reflection or contemplation. It just lets go. Habits by themselves are too organized, too insistent and determinate to need to indulge in inquiry or imagination. And impulses are too chaotic, tumultuous and confused to be able to know even if they wanted to. Habit as such is too definitely adapted to an environment to survey or analyze it, and impulse is too indeterminately related to the environment to be capable of reporting anything about it. Habit incorporates, enacts or overrides objects, but it doesn't know them. Impulse scatters and obliterates them with its restless stir. A certain delicate combination of habit and impulse is requisite for observation, memory and judgment. Knowledge which is not projected against the black unknown lives in the muscles, not in consciousness. We may, indeed, be said to _know how_ by means of our habits. And a sensible intimation of the practical function of knowledge has led men to identify all acquired practical skill, or even the instinct of animals, with knowledge. We walk and read aloud, we get off and on street cars, we dress and undress, and do a thousand useful acts without thinking of them. We know something, namely, how to do them. Bergson's philosophy of intuition is hardly more than an elaborately documented commentary on the popular conception that by instinct a bird knows how to build a nest and a spider to weave a web. But after all, this practical work done by habit and instinct in securing prompt and exact adjustment to the environment is not knowledge, except by courtesy. Or, if we choose to call it knowledge--and no one has the right to issue an ukase to the contrary--then other things also called knowledge, knowledge _of_ and _about_ things, knowledge _that_ things are thus and so, knowledge that involves reflection and conscious appreciation, remains of a different sort, unaccounted for and undescribed.