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Woods, and Benedict: Report of preliminary investigations on the metabolism of nitrogen and carbon in the human organism with a respiration calorimeter of special construction, U. S. Dept. of Agr., Office of Experiment Stations Bulletin 44. (1897.) JW. O. Atwater and F. G. Benedict: A respiration calorimeter with appliances for the direct determination of oxygen. Carnegie Institution of Washington Publication No. 42. (1905.) 1 * As this report goes to press, this calorimeter is well on the way to completion. This panel, however, is made as narrow as possible, so that practically all changes can be made by taking out the adjacent panels.

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Douglas method 248 Valves 250 Breathing appliances 252 Pneumatic nosepieces 253 Glass nosepieces 254 Mouthpiece 255 Mask 256 Gas analysis 257 Accuracy and interpretation of results 260 5. Tension-equalizer with three-way valve and mouthpiece 6. Carbon-dioxide absorber and accompanying water-absorber 7. Moistener 8. Apparatus used for tests of respiration apparatus with burning ether 9. Schematic outline of ventilation system of spirometer unit 10. Detailed plan of ventilation system in spirometer unit 11. Cross-section of the three-way valve, ventilating pipe, and connection for mouthpiece and moistener 12. Details of moistener and connection for nosepieces 13. Details of spirometer, with recording attachments 14. Specimen graphic record of respiration 15. Bohr meter 16. General view of the spirometer unit 17. Specimen kymograph records in the calibration of the ventilation adder.. . 18. Mouthpiece and valves used in the Zuntz-Geppert apparatus 19. Most recent form of the Zuntz valves 20. Zuntz-Geppert apparatus, showing Elster meter, automatic sampling device, and gas-analysis apparatus " 21. Caustic potash pipette used in the Zuntz-Geppert analysis apparatus 22. Absorption pipette used in the Zuntz-Geppert analysis apparatus 23. Nosepieces and valves used with the Tissot method 24. Modified glass nosepieces 25. Apparatus for registering the respiration-rate used with the Tissot method. 26. Tissot spirometer with capacity of 50 liters 27. Tissot spirometer with capacity of 200 liters 28. Apparatus for registering the volume of air in the Tissot spirometer 29. Mica-flap valve used with the Douglas method 30. Rubber-flap valve used with the Douglas method 31. Mueller valve 32. Haldane gas-analysis apparatus (laboratory form) 33. Hand spirometer 34. Apparatus used for alcohol check-tests of the Tissot method 35. Type of respiration of subject H. F. T. as shown by chest pneumograph in the first period with the bed calorimeter on August 29, 1911 36. Type of respiration of subject H. F. T. in the first period with the bed calorimeter on August 31, 1911 37. Probability curves for the series of comparison experiments with the spirometer unit and the tension-equalizer unit 38. Probability curves for the series of comparison experiments with the tensionequalizer unit and the Zuntz-Geppert apparatus 39. Types of respiration of subject H. F. T. in third and sixth periods with the spirometer unit on January 18, 1912 40. Types of respiration of subject H. F. T. in first and second periods with the spirometer unit on January 30, 1912 131 41. Types of respiration of subject P. F. J. in the seventh and eighth periods with the spirometer unit on February 7, 1912 133 42. Probability curves for the series of comparison experiments with the spirometer unit and the Zuntz-Geppert apparatus 143 43. Probability curves for the series of comparison experiments with the tensionequalizer unit and the Tissot apparatus 151 44. Probability curves for the series of comparison experiments with the spirometer unit and the Tissot apparatus 161 6 I...

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