A NOTE OF APPRECIATION ix 



knowledge. It is remarkable that the great scholar was able to bring this 

 phase of his studies to such a logical completeness within his lifetime. 



Palladin's inspiration still works in the minds and lives of his students, and 

 his contributions to science have become a permanent part of the mental equip- 

 ment of mankind. The results of his studies and the bent and trend of his 

 clear thought have left a lasting effect, even upon dwellers in far countries. 

 The publication of this second printing of the English edition of the Physiology 

 furnishes a significant illustration of the unity of science, in space as well as in 

 time, and of the true immortality of the scientific spirit. 



Burton E. Livingston. 

 Desert Laboratories, 

 Tucson, Arizona, 

 August, 15, 1922. 



