402 Carhon-dioxide Excretion in Man [April 



tion tliroughout tlie work were qiiite irregulär, there were three 

 negative coefficients with values — 0.2, — 0.04, and — 0.18. 



These results are, perhaps, what might have been expected. 

 The barometric change is evidently a minor influence and its effect 

 is there fore liable to be masked by other influences, such as exercise, 

 amount and character of meals, etc. Moreover, the effect upon the 

 muscular endurance noted by Prof. Lombard in bis own case has 

 not been verified in the case of other subjects. The writer is of the 

 opinion that if a series of parallel ergographic and respiration ex- 

 periments were made on a number of subjects, it would be found 

 that positive effects of barometric changes on muscular endurance 

 are accompanied in general by positive coefficients of correlation of 

 barometric change with rate of excretion of carbon dioxide. 



This work was done in the Physiological Laboratory of the 

 University of Michigan, with the apparatus described by Higley 

 and Bowen {American Journal of Physiology, i904-'o5, xii, p. 31 1 ). 



