The London Edinburgh and Dublin Philosophical Magazine and Journal of Science
89 weighed at the end of a certain time. Each vessel was found to contain as nearly as possible the same measure of hydrogen ; and a like equality of action upon the zinc had taken place throughout the series. Tile total quantity of hydrogen was 60"6 cubic inches; the total quantity of zinc expended was 74"0 grains. Now, I had previously determined that 8¢'5 grains of the zinc I employed were needed to produce an equivalent of hydrogen ; and taking the weight of 100 cubic inches to be 2"1318
... hes to be 2"1318 grains, we have the measure of an equivalent of hydrogen equal to 46~9 cubic inches. Therefore, the 7¢'0 grains of zinc here consumed should have yielded 100"5 cubic inches of the gas, but they actually yielded" only 60'6 cubic inches. Whether or not a vohameter were interposed the results were similar : invariably the same want of correspondence appeared between the loss of the zinc and the volume of evolved gas and their relative quantities as fi)und by theory ; and the amount of this difference was always some'what simi]ar to that exhibited in the above experiment~ The operations within the cells of tile battery admit of easy analysis, and this phzenomenon also admits perhaps of an easy explanation ; but the fact it seems to indicate, viz. that a certain portion (and that about one third of the whole) of the hydrogen subserves some purpose closely connected with the power of the battery to decompose water, appears to be of so much importance as to make it deserving of a more careful examination.