146 AUTHORITIES 



12. General physiology. 



Very much has been written on this subject, but see Verworn, 

 General Physiology (Macmillan, 1899). The best recent book on 

 the chemistry of the animal tissues is Wells' Chemical Pathology 

 (Saunders, New York, 1907). 



13. The origin of life. 



The suggestion that life originated in accumulations of amino- 

 acids due to plutonic activity is made by Snyder, Science Progress, 

 April, 1909, and July, 1911. These papers contain full references. 

 The suggestion that life reached the earth from cosmic space is 

 an old one, but it is now based on an argument derived from 

 recent work on the radiation pressure of light, by Arrhenius ; see 

 Worlds in the Making (Harper Bros. 1908). 



14. The theory of migration by Intoxications. 



This is due to Gurley ; see American Journal of Psychology, 

 Vol. 20, p. 102, 1909. 



