This book partakes of the character of a sermon to scientists in general and physicians in particular. Its platform may be best stated in the following words from Dr. Harbin's argumentum: "It is endeavored to produce an argument for the identities of the physical, intellectual and spiritual natures, respectively, and their relations to the Infinite Material Universe and Infinite Moral Universe. Health relates to the former, while happiness belongs to the latter realm. Science has to do with the material, while religion concerns the moral sphere. Infraction of the laws of Nature brings disease, while violation of the moral law brings unhappiness. While health has some bearing on happiness, there is no necessary causative relation between the two, for there may be happiness without health and vice versa, and it is not within the purpose of this discussion to refer to that phase of the subject." The argument unfolds Dr.