water-vapor and oxygen absorption 91 Control experiments with burning alcohol 91 Balance for weighing subject 93 Pulse rate and respiration rate 95 Routine of an experiment with man 96 Preparation of subject 96 Sealing in the cover 97 Routine at observer's table 97 Manipulation of the water-meter 98 Absorber table 99 Supplemental apparatus 100 ILLUSTRATIONS. PAGE Fig. 1. General plan of respiration calorimeter laboratory 4 2. General view of laboratory taken near main door 4 3. General view of laboratory taken near refrigeration room 4 4. General view of laboratory taken near temperature recorder 4 5. View of laboratory taken from entrance of bed calorimeter 4 6. Plan of heating and ventilating the calorimeter laboratory 6 7. Horizontal cross-section of chair calorimeter 11 8. Vertical cross-section of chair calorimeter 12 9. Vertical cross-section of chair calorimeter from front to back 13 10. Photograph of framework of chair calorimeter 14 11. Photograph of portion of framework and copper shell 14 12. Cross-section in detail of walls of calorimeter 16 13. Detail of drop-sight feed-valve and arrangement of outside cooling circuit 18 14. Schematic diagram of water-circuit for the heat-absorbers of the calorimeter 22 15. Detail of air-resistance thermometer 28 16. Details of resistance thermometers for water-circuit 30 17. Diagram of wiring of observer's table 32 18. Diagram of rheostat and resistances in series with it 36 19. Diagram of wiring of differential circuit with shunts used with resistance thermometers for water-circuit 38 20. Diagram of galvanometer coil, used with recording apparatus for resistance thermometers in water-circuit 40 21. Diagram of wiring of circuits actuating plunger and creeper 41 22. Diagram of wiring of complete 110-volt circuit 41 23. Temperature recorder 42