ENDOCRINE GLANDS 



schools of physiology to find anything which shows any 

 equivalent improvement. 



THE ADDITIONS OF MODERN ANATOMY 

 AND PHYSIOLOGY. 



With Claude Bernard, the physiological action of the 

 vegetative nerves was made more precise, and the physio- 

 logical and biological significance of these systems became 

 evident. Claude Bernard showed the action of the sympa- 

 thetic in the regulation of the vegetative processes, secre- 

 tions, vaso-motors, heat regulating mechanism, etc. 



Finally, English physiologists, Langley and Gaskell in 

 particular, after adding to the work of Claude Bernard 

 and his successors a number of essential facts, after having 

 shown the importance of the electivity of reactions of the 

 vegetative system to organic substances, established a 

 new theory in which an enlarged vegetative system, more 

 definite in its physiopharmacological details is put in 

 value as to its physiopharmacological antagonism and its 

 physiological relation to the glands of internal secretion. 

 There are therefore three periods in the study of the 

 vegetative system. 



An initial period chiefly morphological, that of Winslow, 

 Johnstone and Bichat. 



A physiological period, J. Mueller, Claude Bernard. 



A physiochemical period, the work of the English school. 



The evolution of the theory in time, will be the plan 

 followed for the evolution of thought, corrected of errors 

 and wrong conceptions, in all things should be considered 

 as the best way to expose a plan. 



At the end of this first chapter let us conclude that to 

 have a definition of the nervous system of the vegetative 

 life, as shown by Bichat and others, we must insist that the 

 body contains two distinct systems: An animal life 



