PHYSIOLOGY OF MAR 



CHAPTEE I. 



HTJNGEK, THIEST, AST) INAOTTION. 



General considerations Appetite Circumstances which modify the appetite- 

 Influence of climate and temperature Influence of exercise and occupation 

 Influence of habit Influence of alcohol, tobacco, etc. Influence of extir- 

 pation of the spleen or of one kidney Hunger Location of the sense of 

 hunger Thirst Location of the sense of thirst Inanition Loss of weight 

 in inanition Effects of inanition on circulation, respiration, animal tempera- 

 ture, and the nervous system Duration of life in inanition Insufficient ali- 

 mentation. 



THE power of self-regeneration is one of the great dis- 

 tinctive properties belonging to all organized living bodies. 

 In the organism of animals, every part is continually under- 

 going what may be called physiological decay ; the organic 

 nitrogenized principles are being constantly transformed into 

 effete matter; and as these principles never exist without 

 inorganic principles, with which they are closely and insep- 

 arably united, it is found that the products of their decay 

 are always discharged from the body in combination with in- 

 organic matters. This process of molecular change is a ne- 

 cessary and inevitable condition of life. Its activity may be 

 increased or retarded by various means, but it cannot be 

 arrested. The excrementitious principles which are thus 

 formed are produced constantly by the tissues, and must be 

 continually removed from the organism, otherwise they 



