xxviii CONTENTS. 



PAGK 



§ 426. The regulation of the temperature of the body by variation in the 



loss of heat. The skin the great regulator 641 



§ 427. The production of heat, the circumstances determining it ; the 



effects of meals and of labour 643 



§ 428. The influence of the nervous mechanism in determining the pro- 

 duction of heat ; the effects of heat and cold on the metabolism 

 of the body are produced through the nervous system . . 645 



§ 429. The portions of the central nervous system concerned in this regu- 

 lation of heat 647 



§ 430. The narrow limits within which the bodily temperature is main- 

 tained 647 



§ 431. Abnormally high temperatures, pyrexia 648 



§ 432. The effects of great heat 649 



§ 433. The effects of great cold 650 



SECTION III. 



On Nutrition in general. 



§ 434. The general features of metabolism . . ... . . 651 



§ 435. The metabolism of muscle as typical of the metabolism of tissues ; 



the nature of the food of muscle 652 



§ 436. The fate of the lactic acid produced by muscle .... 653 



§ 437. A comparison of the metabolism of muscular tissue with that of 



other tissues 653 



§ 438. Proteid substance the pivot of metabolism 654 



§ 439. The influence of nerves on metabolism ; katabolic and anabolic 

 nerves. The influence of the nervous system on the general 

 nutrition of the tissues. The phenomena of disease, &c. ; trophic 

 nerves 654 



SECTION IV. 



On Diet. 



§ 440. The normal diet, statistical and experimental 658 



§ 441. The necessity for all three food-stuffs, proteids, fats, and carbo- 

 hydrates. The necessity and importance of salts including 



extractives ; alcohol, &c 660 



§ 442. The chemical value of articles of food to be corrected by their 



digestibility 662 



§ 443. The physiological value of a purely vegetable diet .... 664 

 § 444. The modifications of a normal diet needed to meet variations in size 667 

 § 445. The modifications of a normal diet needed to meet changes of climate 667 

 § 446. The modifications of a normal diet needed to promote or prevent 



fattening 668 



§ 447. The modifications of a normal diet needed to meet muscular and 



mental labour 669 



