66 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 60 



CO2 was let into chamber from the bag outside. Fans put on to thoroughly 

 mix atmosphere. Sample (No. 2) taken. Analysis: CO2 2.76 per cent; O2 

 18.13 P er cent. 



Series III. CO2 on and fans off. 



Average volume breathed, 13.3 liters per minute. 

 Series IV. CO2 on and fans on. 



Average volume breathed, 11.1 liters per minute. 



November 9, 1910. Series I. R. A. R. and I. F. in chamber. Subject, 

 R. A. R. Work done by lifting weight 12 times per minute. C0 2 absorbed 

 and fans off. 



Average volume breathed, 17.7 liters per minute. 



