Abstract
The observations here recorded were carried out by the method and with the apparatus described in a former paper, to which reference must be made for details. It must suffice to say that the globe containing the gas to be weighed was filled at 0°C., and to a pressure determined by a manometric gauge. This pressure, nearly atmospheric, is slightly variable with temperature on account of the expansion of the mercury and iron involved. The actually observed weights are corrected so as to correspond with a temperature of 15°C. of the gauge, as well as for the errors in the platinum and brass weights employed. In the present, as well as in the former, experiments I have been ably assisted by Mr. George Gordon.

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