450 



PHYSIOLOGY 



CHAP. 



equilibrium at the close of expiration. The acceleration of the 

 cardiac movements persists; thirty-eight beats may be counted 

 in 20 seconds. Ten minutes from the commencement of the 



FIG. 205. Normal tracings of respiration (R) and carotid pulse '(P) in a ,dog after exposing the 

 rhomboidal sinus. (Aducco.) R, Tracing recorded with Marey's pneumograph ; P, with 

 Marey's metal -manometer ; s", with Deprez signal. 



experiment the active expirations also cease, and the animal 

 quickly succumbs to asphyxia, unless artificial respiration with 

 the bellows is resorted to. 



FIG. 206. Same as preceding, one minute after applying O'o grm. cocaine ointment to floor of 

 4th ventricle. (Aducco.) 



The paralysing action of cocaine on the bulbar centres was con- 

 firmed by Aducco with the addition of a highly characteristic 

 group of effects; enormous dilatation of pupil, insensibility of 





