248 MAN --AN ADAPTIVE MECHANISM 



To secure complete freedom from noxious physical 

 and psychic stimuli throughout the whole course of the 

 operation, no one anesthetic is entirely adequate, any 

 more than one set of rules of conduct is applicable to 



$& 

 *&** 



A. B. 



Section of normal cere- Section of cerebellum Section of cerebellum 

 bellum of dog. of dog after continuous of dog after the con- 



administration of ether tinuous administration 

 for four hours. of nitrous oxid for four 



hours. 



FIG. 59. COMPARATIVE EFFECTS OF ETHER AND OF NITROUS OXID ON 



THE BRAIN-CELLS OF DOGS. 



Compare the hypochromatic and disorganized appearance of the Purkinje 

 cells in B with the hyperchromatic Purkinje cells in C. 

 (From photomicrographs, X 310.) 



the handling of every case. An intelligent selection- 

 and careful combination of anesthetics, adjusted to the 

 needs of the individual patient, is the rule. 



As a general anesthetic in routine cases, nitrous 

 oxid-oxygen is preferred to ether, for many reasons. It 



