178 GLANDS IN HEALTH AND DISEASE 



exertion, emotion, infection, etc. . . . The injection 

 of adrenaline causes an immediate increase in the 

 conductivity of the brain to above normal, followed 

 by a later decrease to below the normal; more- 

 over, adrenaline causes an immediate increase in 

 the temperature of the brain, as evidenced by 

 thermo-couple measurements." 



The work of Drs. Steivart and Rogoff. In dis- 

 cussing Dr. Cannon's work we have also referred, 

 a number of times, to that of Drs. Stewart and 

 Rogoff, if only because the latter two are equally 

 eminent authorities, and mainly because they com- 

 bat much of what Cannon has to say. The nature 

 of this work and the limitations of space will pre- 

 vent us from giving details, but the reader who is 

 interested may refer to the list of references to their 

 work that is included in the bibliography. 



Adrenaline is the big theme. Is there or is there 

 not an increase of this substance when an animal is 

 emotionally aroused? We have already suggested 

 that Stewart's answer is in the negative, and that 

 he explains Cannon's positive results by finding 

 fault with the method employed, and with the way 

 in which the results were interpreted. 



It will also be remembered that Cannon makes 

 much of the fact that not only does adrenaline give 

 rise to a hyperglycemia, but what might be ex- 

 pected if what Cannon asserts is true so do the 

 emotions when aroused sufficiently; for, according 



