NO. 23 INFLUENCE OF ATMOSPHERE ON HEALTH 



Series IT. CO? absorbed and fans on. 



69 



Average volume breathed, 34 liters per minute. Average tidal air, 1,709 cc. 

 H. B. W. said he found the work much more easily performed when the 

 fans were on. 



CO.. let into chamber from the bag outside. Fans were put on to thoroughly 

 mix the atmosphere and were then stopped and records taken. Sample taken. 

 Analysis: CO 2 3.75 per cent; O? 16.31 per cent. 



Series III. CO2 and fans oft*. 



Average volume breathed, 48 liters per minute. Average tidal air. 2,063 cc. 

 Series IV. CO2 and fans on. 



Average volume breathed, 51 liters per minute. Average tidal air, 2,261 cc. 



Sample taken. Analysis : CO2 5.07 per cent ; O2 14.8 per cent. 



December 3, 1910. Series I. R. A. R. performed work by lifting a 20- 

 kilogram weight over a pulley, 12 times per minute for series of 5 minutes. 

 CO2 absorbed and fans off. 



Average volume breathed, 27 liters per minute. 



Pulse records for a few minutes afterwards: At the end of 1st minute, 

 104 per minute; 2d minute, 102; 4th minute, 102; 6th minute, 04. After 3 

 minutes of fans on : Pulse 88. 



