In time this gulf is as wide as from the present to several millions of years previous to the glacial period. Prof. Wallace is so astonished at the difference between the brain of the most savage man and the highest animal, that he declares the theory of evolution, which he was first to promulgate, while it accounts for all the forms of life, here fails, and that man stands alone, the creature of another creation. While he says that man “May even have lived in the miocene or eocene period, when not a single mammal was identical in form with any existing species,” yet he does not place the origin of man at a sufficiently remote era in those receding æons of time. In the primitive human being, thought began its conquest of the world, and the man of to-day represents the accumulation of all experiences since his ancestors fought with cunning craft the huge megatherium, and disputed for supremacy of the tertiary forests with palæotherium, and other monsters of that age. In time, the gulf between him and the animal world is thus widened, and in size of brain, which measures as a psychic metre, the growth of the superior life, he is equally distant. It has been remarked that the brain of the savage was so much larger than the exigencies of his life demanded, that it was comparable to giving the wing of an eagle to a hedge sparrow, or the arm of a tiger to a mouse. Rightly read, this proves the vast duration of time during the differentiation of man from the animals below him. Psychic growth is marked by enlargement of brain, and as long ago as the earliest preserved geological traces of humanity are found, that organ had attained a size and form about equal to that of the present. Its attainments have become so great that it is difficult at present to compare its intelligent manifestations with the instinctive desires of animals. The brains of all the lower types in certain essentials of organic life are alike, but in the great lobes which, superimposed, mark the degrees of psychic life, the human being stand alone, and is human because of the mental qualities these lobes indicate.