1878.] the Function of Respiration at Various Altitudes. 303 



acid necessary to long-continued exertion, which supply becomes 

 thereby reduced in quantity. 



EXPLANATION OF THE EIGUEE. 



A. India-rubber bag acting as a diverticulum. 



B. Pipette delivering 100 c.c. of the barium solution. 



C. Tube for the analysis of the air expired, of a capacity of about 1*5 litre. 



Appendix. Received April 2. 



If the relative humidity of the atmosphere should fall at increasing 

 altitudes this might be considered as an additional cause of loss of heat 



