vi PHYSIOLOGY 



loss of heat by the evaporation of moisture from the lungs and skin, in 

 order to protect the organism from heat. 5. Experiments and clinical 

 observations showing the thermic effects of injuries to the spinal cord 

 and brain. General theory of the regulation of the exchange of material 

 and energy by the nervous system. Bibliography. 



CHAPTER III 



THE THEORY OF HUMAN NUTRITION . . . .88 



1. Composition of the principal articles of food of animal and vege- 

 table origin ; theory of the normal diet for adult man, deduced from 

 the statistics of nutrition drawn up by Voit, Atwater, and Tigerstedt. 

 2. Criticism of the statistical method. Experimental researches of 

 Hirschfeld, Kumagawa, Klemperer, Siven, Caspari, and Albu, proving 

 that nitrogenous equilibrium can be maintained on a diet considerably 

 less abundant than that in common use. 3. Fletcher's case scientifically 

 illustrated by Chittenden. 4. Chittenden's recent experimental re- 

 searches on three groups of persons, proving the theory of reduced or 

 economical nutrition. 5. The question of vegetarianism. 6. Variations 

 of diet in relation to sex, the stage of growth (anaplasia), and old age 

 (cataplasia). Bibliography. 



CHAPTER IV 



THE GENERATIVE SYSTEM OF THE MALE . . . .120 



1. Structure of the testicle ; formation of the spermatoblasts and 

 spermatozoa ; characters and chemical composition of the sperm ; physio- 

 logical properties of the spermatozoa. 2. Structures and functions of 

 the epididymis, vas deferens, and vesiculae seminales. 3. Structures and 

 functions of the prostate and Cowper's glands. 4. Structure of the cor- 

 pora cavernosa of the penis, urethra, and glans ; theory of the mechanism 

 of erection. 5. Expulsive muscular forces on which the ejaculation of 

 the seminal fluid depends. 6. The nervous centres and nerves concerned 

 in erection and ejaculation. 7. The influence of the activity of the male 

 genital apparatus on the organism as a whole, deduced particularly from 

 the effects of castration. Bibliography. 



CHAPTER V 



THE GENERATIVE SYSTEM OF THE FEMALE . . .* 160 



1. The ovary and the Graafian follicles, primary and vesicular ; 

 ovulation, follicular atresia, and formation of the corpora lutea. 2. 

 The uterus and Fallopian tubes ; the phenomena of female puberty ; the 



