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with solid ammonium bicarbonate. The volume of the sample of gas taken is measured at a given pressure and temperature. The combustion of the gas has the effect of producing one volume of nitrogen for two of the volumes of ammonia according to the equationHence the volume of nitrogen obtained represents twice that volume of ammonia in the original sample. The volume of carbon dioxide is not changed during combustion, whereas the original volume of water is increased by the water derived from the oxidation of ammonia. This increased water volume is of no consequence in the analysis, however, since all the water is absorbed by phosphorus pentoxide before measuring the carbon dioxide and nitrogen. The volume of water in the original sample is determined as the difference between the volume of the original sample and the sum of the volumes of carbon dioxide measured directly, and of ammonia calculated from the measured nitrogen.All volumes are reduced to 0" C. and 760 mm. of mercury by use of the gas law equation 273 pv = 760(t + 273) where p = pressure of gas in mm. of mercury v = volume in ml. t = temperature in O C.The weights in grams of the gases were calculated from the volumes VO by the equationV O X mol. wt. of gas 22400 W =