Considerable space is devoted to the consideration of man's place in nature, and especially to the discussions arising out of the comparison of the human and simian brain; and while the author fully admits the vast gulf placed between man and the animal creation below him-a gulf which science cannot bridge-by virtue of the moral and religious nature of man, yet he pointedly protests against confounding distinct orders of ideas, and insists that man as a physical being is clearly of the same order as the gorilla and ape; and he does not shrink from accepting the possibility that they all may have sprung by successive stages or 'leaps' from the same primordial form. His concluding words are, that 'so far from having a materialistic tendency, the supposed introduction into the earth at successive periods of life-sensation, instinct, the intelligence of the higher mammalia, bordering on reason-and lastly the improvable reason of man himself, presents us with a picture of the ever-increasing dominion of mind over matter.