TO face page 10-1. 



Fio. 2. The Laboratory Room. View from southeast corner. Respiration Chamber at right; Water and 

 Carbon-Dioxide Absorbing System in center ; Balance for Weighing Absorbers at left. 



FIG. 3. Laboratory Room. View from east side. Observer's Table and Water- Meter in foreground ; Window 

 of Respiration Chamber open ; Absorbing System and Balance at left. 



