Finally, in Man the whole force of organic power attains an inward and centripetal direction, and the “apex of the living pyramid”becomes a fit receptacle for Reason and Conscience. * * * * * It is much to be regretted, that the estimable Author did not live to put a finishing hand to this Essay; but the part completed involves speculations of so interesting a nature, and presents such striking marks of deep and original thought, that the Editor, to whose hands it was committed, did not feel himself justified in withholding it from the judgment of the public. PHYSIOLOGY OF LIFE. Introduction. When we stand before the bust of John Hunter, or as we enter the magnificent museum furnished by his labours, and pass slowly, with meditative observation, through this august temple, which the genius of one great man has raised and dedicated to the wisdom and uniform working of the Creator, we perceive at every step the guidance, we had almost said, the inspiration, of those profound ideas concerning Life, which dawn upon us, indeed, through his written works, but which he has here presented to us in a more perfect language than that of words—the language of God himself, as uttered by Nature. That the true idea of Life existed in the mind of John Hunter I do not entertain the least doubt; but it may, perhaps, be doubted whether his incessant occupation, and his stupendous industry in the service, both of his contemporaries and of posterity, added to his comparatively slight acquaintance with the arts and aids of logical arrangement, permitted him fully to unfold and arrange it in distinct, clear, and communicable conceptions. Assuredly, however, I may, without incurring the charge of arrogance or detraction, venture to assert that, in his writings the light which occasionally flashes upon us seems at other times, and more frequently, to struggle through an unfriendly medium, and even sometimes to suffer a temporary occultation. At least, in order to dissipate the undeniable obscurities, and to reconcile the apparent contradictions found in his works,—to distinguish, in short, the numerous passages in which without, perhaps, losing sight internally of his own peculiar belief, he yet falls into the phraseology and mechanical solutions of his age,—we must distinguish such passages from those in which the form corresponds to the substance, and in which, therefore, the nature and essential laws of vital action are expressed, as far as his researches had unveiled them to his own mind, without disguise. To effect this, we must, as it were, climb up on his shoulders, and look at the same objects in a distincter form, because seen from the more commanding point of view furnished by himself. This has, indeed, been more than once attempted already, and, in one instance, with so evident a display of power and insight as announces in