PLATE XCII 



General view of the respiration calorimeter 



A, Chamber inclosed in heat-insulating cover. B, Tension equalizer to main- 

 tain atmospheric pressure in the air of the chamber. C, Absorber table. D, Rotary 

 pump to maintain air circulation. E, Motor to drive pump. F, Bottles containing 

 sulphuric acid to remove water vapor from circulating air. G, Large U-tube, con- 

 taining soda-lime to remove carbon dioxid from the air. H, Bottle containing sul- 

 phuric acid to catch the water vapor from the soda-lime. /, Bottle containing cot- 

 ton to catch sulphuric acid vapor. /, Small absorbers for determining water vapor 

 and carbon dioxid in residual air. K, Meter to measure the sample of residual air. 

 L, Reservoir to maintain a constant pressure of water in the heat absorber in the 

 chamber. M, Tank to catch water flowing from the heat absorber. N, Pump to 

 raise water from the tank to the reservoir. O, Devices for automatically controlling 

 and recording temperatures. 



