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ILLUSTRATIONS. 
Page 
Bicycle ergometer and universal respiration apparatus Frontispiece. 
Fig. 1. Calibration curves showing heat per revolution of ergometer II 27 
2. Schematic outline of the respiration apparatus 28 
3. Tension equalizer and flexible mouthpiece 29 
4. Curves showing oxygen consumption per minute with the subject riding 
at different speeds and with varying loads 137 
5. Curves showing the total heat output per minute and corresponding external 
muscular work per minute, expressed in calories, for subject riding with 
constant load — 1.5 amperes — at varying speeds 138 
6. Curves showing the pulse-rate when the external muscular work was equiv- 
alent to 1.05 calories per minute 153 
7. Curves showing the pulse-rate when the external muscular work was equiv- 
alent to 1.5 calories per minute 154 
8. Curves showing the pulse-rate when the external muscular work was equiv- 
alent to 2.0 calories per minute 155 
9. Curves showing the pulse-rate when the external muscular work was equiv- 
alent to 2.25 calories per minute 156 
10. Continuous records of the rectal temperature obtained by thermal element 
during severe muscular work 158 
