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15-minute periods 1912.—Spirometer unit additional dead space air in apparatus analysis appa apparatus alternated apparatus spirometer unit automatic counterpoise Average barometric pressure Average pulse Average respira average temperature beats per minute bed calorimeter Benedict respiration apparatus breathing burette Carbon dioxide eliminated cent comparison experiments Composition of expired connected cylinder difference Douglas apparatus Douglas method equalizer unit exchange in comparison experimental period expired air food.)—Continued gas-analysis apparatus glass nosepieces June June 27 kymograph laboratory leak liters meter mouthpiece Mueller valves Oxygen absorbed oxygen consumption Period beginning phosphorus pipette Pneumatic nosepieces pneumograph potash preliminary period Pulse-rate uniform ratus respiration apparatus spirometer respiration of subject respiration-rate respiratory exchange respiratory quotient results obtained rubber tubing sample second period series of comparison sorbed spirometer bell stopcock temperature of air three-way valve tion tion-rate Tissot apparatus Tissot spirometer Tissot valves tory quotient Type of respiration variations water-vapor Zuntz Zuntz-Geppert apparatus