General description of the respiration apparatus 54 Testing the chamber for tightness 54 Ventilation of the chamber 54 Openings in the chamber 55 Ventilating air-current 57 Blower 57 Absorbers for water-vapor 58 Potash-lime cans 60 Balance for weighing absorbers 61 Purification of the air-current with sodium bicarbonate 63 Valves 63 Couplings 64 Absorber table 65 Oxygen supply 67 Automatic control of oxygen supply 69 Tension equalizer 71 Barometer 72 Analysis of residual air 73 Gas-meter 75 Calculation of results 76 Analysis of oxygen 76 Advantage of a constant-temperature room and temperature control 77 Variations in the apparent volume of air 77 Changes in volume due to the absorption of water and carbon dioxide 78 Respiratory loss 78 Calculation of the volume of air residual in the chamber 79 Residual analyses 80 Calculation from residual analyses 80 Influence of fluctuations in temperature and pressure on the apparent volume of air in the system 83 Influence of fluctuations in the amounts of carbon dioxide and water-vapor upon residual oxygen 83 Control of residual analyses 84 Nitrogen admitted with the oxygen 84 Rejection of air 85 Interchange of air in the food aperture 85 Use of the residual blank in the calculations 86 Abbreviated method of computation of oxygen admitted to the chamber for use during short experiments 88 Criticism of the method of calculating the volume of oxygen 89 Calculation of total output of carbon dioxide and