The first great awakeners of the mind seem to be the wants of the body. (It was my intention to have entered at some length into this subject as a kind of second part to the Essay. A long interruption, from particular business, has obliged me to lay aside this intention, at least for the present. I shall now, therefore, only give a sketch of a few of the leading circumstances that appear to me to favour the general supposition that I have advanced.) They are the first stimulants that rouse the brain of infant man into sentient activity, and such seems to be the sluggishness of original matter that unless by a peculiar course of excitements other wants, equally powerful, are generated, these stimulants seem, even afterwards, to be necessary to continue that activity which they first awakened. The savage would slumber for ever under his tree unless he were roused from his torpor by the cravings of hunger or the pinchings of cold, and the exertions that he makes to avoid these evils, by procuring food, and building himself a covering, are the exercises which form and keep in motion his faculties, which otherwise would sink into listless inactivity. From all that experience has taught us concerning the structure of the human mind, if those stimulants to exertion which arise from the wants of the body were removed from the mass of mankind, we have much more reason to think that they would be sunk to the level of brutes, from a deficiency of excitements, than that they would be raised to the rank of philosophers by the possession of leisure. In those countries where nature is the most redundant in spontaneous produce the inhabitants will not be found the most remarkable for acuteness of intellect. Necessity has been with great truth called the mother of invention. Some of the noblest exertions of the human mind have been set in motion by the necessity of satisfying the wants of the body. Want has not unfrequently given wings to the imagination of the poet, pointed the flowing periods of the historian, and added acuteness to the researches of the philosopher, and though there are undoubtedly many minds at present so far improved by the various excitements of knowledge, or of social sympathy, that they would not relapse into listlessness if their bodily stimulants were removed, yet it can scarcely be doubted that these stimulants could not be withdrawn from the mass of mankind without producing a general and fatal torpor, destructive of all the germs of future improvement.