Those who adopt the spiritual explanation are right when they defend... a... transcendence of man over the rest of nature. But neither are the materialists wrong when they maintain that man is just one further term in a series of animal forms. Here, as in so many cases, the two antithetical kinds of evidences are resolved in a movement... to the highly natural... 'change of state'. From the cell to the thinking animal, as from the atom to the cell, a single process (a psychical kindling or concentration) goes on without interruption... in the same direction. But by virtue of this permanence in the operation, it is inevitable... that certain leaps... transform the subject of the operation.