Preface. v 



sensation, thought, feeling, and will; the building up, sustain- 

 ing, and repairing of the organism ; the removal of its waste 

 matter and impurities ; the peculiarities of individual organisa- 

 tions ; and the phenomena and laws of life and death. 



PART FOURTH treats of the most important superadded func- 

 tion of generation, or reproduction, as it exists in vegetables, 

 animals, and the human species ; the unfolding of the body from 

 its germ ; the relations of the sexes in love and marriage; the 

 laws of paternity, or the influence of parents upon the physical 

 and moral characters of their children ; the laws of sexual 

 morality, and those problems of the sexual relation, so difficult 

 to treat in a popular work, and yet so necessary to be known, 

 that they cannot with any propriety be omitted. A work on 

 Human Physiology which does not treat of the function of 

 reproduction, is as great a monstrosity as would be a human 

 being in whom that function did not exist. I believe that the 

 whole subject is treated in this work in such a manner as will 

 satisfy every reasonable requirement, and at the same time give 

 no reasonable offence. I have earnestly endeavoured, in the 

 letterpress and illustrations, to give all necessary and useful 

 information upon subjects of vital importance, and, at the same 

 time, to avoid any possible injury. 



PART FIFTH treats comprehensively of Health, its laws 

 and conditions ; and of Disease, its causes, prevention, and 

 cure. This will probably be considered by many the most 

 valuable, and practically useful portion of the work ; and I 

 am sure the chapters on medical systems and practice, and 

 Hydropathy, or the water cure, will be read with interest and 

 profit. 



PART SIXTH contains the application of the leading principle 

 or idea of the work to Education, Morals, and Society ; and is 

 an attempt to point out the kind of social organisation required 

 by the nature of man that which would give occupation to all 

 his faculties, bring out his higher, and restrain or subordinate 



