So deep is this his dependence that it is often not safe for him to exterminate life that he deems pernicious. (3) We find the time occupied in evolution not only congruous with the movement of the forces that take part in it, with the inter-dependence of its several portions, and with the vastness of the field swept over by it, but also with the intellectual structure of man. His thought follows this evolution in the past and takes part in it in the present by means of these measured steps of progress.

Let us intensify to our apprehension this evolution in its relation to him as the one rational being who is its crowning product. An excellent illustration of a supreme power in man, the complex product of stimuli and sensations wrought together automatically and voluntarily, is the vigor with which he maintains an upright position. This attitude, while it is a crowning physical expression of a spiritual preeminence, is mechanically a very weak one. Man, with marvelous poise, is able both in rest and in motion to make his position one of ease and strength. Sight, touch --- as of the foot --- muscular sensations, and still more obscure stimuli --- quite likely due to the semicircular canals of the ear --- concur in this result. The sailor easily and firmly walks the rocking deck, the only steadfast upright thing amid all its lines and planes.

The physical organism mediates in two ways between matter and mind first, by carrying inward impressions made by matter, and, secondly, by bearing outward impulses due to mind. In both of these directions the endowments of man are of a