718 PHYSIOLOGY OF RESPIRATION. 



apparently he has studied cases belonging chiefly to Eyster's 

 first group. None of the suggestions made at present seem to 

 account adequately for the very labored breathing at the acme 

 of the dyspneic phase, and the phenomenon evidently requires 

 further experimental study. 



More or less rhythmical variations in the strength of the 

 breathing movements have been described also in normal sleep, 

 hibernation, chloral narcosis, high altitudes etc., but nothing so 

 definite and characteristic as in these very interesting Cheyne- 

 Stokes cases. 



