AND RATIO OF THEIR ATOMIC WEIGHTS. 



91 



eudiometer about twenty degrees. The hydrogen in the eudiometer soon began to 

 deoi'ease as the e.\[)losions were repeated, showing that now oxygen was in excess. 

 The equilibrium was so easily disturbed that some doubt cannot but be felt 

 whether Leduc obtained the eipiilibriuni whidi he h()p(jd for. 



15. — DENSITY OF ELECTROLYTIC GAS. OBSERVATIONS ON THE EXCESS OF HYDROGEN. 



The determinations of the excess of hydrogen above the atomic ratio in the 

 mixtures whose density was deteiniined, are given in the following table. In the 

 tii'st four experiments, the Bunsen eudiometer was used ; in the others, the large 

 eudiometer containing 3.2 litres. The first column gives the pressui'e originally 

 noted ; the second, the diminution of pressure caused by talcing out a part for analy- 

 sis, the third the excess of hydrogen found in this part; and the last, the I'atio 

 of this hydi'ogen to the whole volume analyzed. 



The mean is .(Mi()2'.»o. This is the ratio of the excess of hydrogen to the whole 

 combined volumes of oxygen and of hydrogen. Multiplying by the factor 3, we 

 have .00088, a cori-ection to be ap[)lied to the i'atio of the hydrogen to the oxygen 

 of the mixture in order to obtain the ratio of the volumes of hydrogen and oxygen 

 which would combine without residue. 



10. DENSITY OF ELECTROLYTIC GAS. OBSERVATIONS. 



The following table gives the particulars of the determinations of the density 

 of the mixture of oxygen and hydrogen obtained by the electrolysis of sodium 

 hydroxide. Seven columns give the mark at which the mei'cury stood in the 

 barometei-, the temperature here, the volume corresponding, this volume reduced 

 to 0°, the volume of the ice-covered connecting tubes, the volume of the small con- 

 necting tube near the voltameter, and the volumes of the globes. Following these 

 are the columns which give the total volume, the pressure, the weight of the 

 mixed gases, and the density computed for the sea level in latitude 45°, accord- 

 ing to the formula 



W 760 i- G^,. 



^■" - v+v+v'H-v"' P 1. g 



