j6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 



Series II. C0 2 on and fans off. 



Average volume breathed, 47.8 liters per minute. Average tidal air, 2,204.06 



Pulse rate during 1st minute 148; 2d minute, 144; 3d minute, 136. 

 Air inside the chamber cooled 22 F. by water cooler with fans on. 



Series III. CO2 on and fans off. 



* Note retardation. 



Average volume breathed, 50.4 liters per minute. Average tidal air, 2,049.2 cc. 



Pulse rate during 1st minute, 134; 2d minute, 110; 3d minute, 104. 

 Sample taken. Analysis: CO2 5.5 per cent; O2 15.57 P er cent. 



August 9, 1911. Series I. H. B. W. lifted weight 12 times per minute for 

 series of 5 minutes. Fans off. Ordinary air of chamber breathed. 



Average volume breathed, 26 liters per minute. Average tidal air, 1,683.24 cc. 



Pulse rate during 1st minute, n6; 2d minute, 112; 3d minute, 106; 4th 

 minute, 95; 5th minute, 100. 



