554 DR. A. SCOTT ON THE COMPOSITION OP WATER BY VOLUME. 
Assuming the impurity to he equally distributed between the two gases we have 
7034'2 of hydrogen unite with 3514'3 of oxygen, 
or 
2-0016 „ „ 1 
If all impurity be in oxygen, we get the ratio 
2-0019 : ], 
and if all in the hydrogen, 
2-0014 : 1. 
For the experiment with the apparatus arranged as in fig. 1 , I have chosen an 
ex])eriment in which the hydrogen measured is in excess of the oxygen. The 
constant volume of the ajiparatus = 3826-3 grms. of mercury. 
April 7th, 1892. Experiment XXXIII., Series He. 
Oxygen from silver oxide (from silver sulphate and potassium hydrate) — 
millims. 
Height of mercury in manometer tube.=154-5 
,, ,, volume tube.=145-4 
Correction.+ 9-1 
Pressure of aqueous vapour.= 13-4 
Capillarity correction . . . . = 3-9 
- 17-3 
Barometer 790-6 — 29-1 .= 761-5 
Pressure of oxygen = 761-5 + 9-1 — 17-3 .= 753-3 
Temperature = 15-92° C. 
Hydrogen from palladium hydride— 
milHins. 
Height of mercury in manometer tube.=154-6 
,, ,, volume ,, .= 145-3 
Correction.+ 9-3 
Pressure of aqueous vapour. J3-5 
Capillarity correction. 3-9 
- 17-4 
Barometer, 790-7 — 29-0 .= 761-7 
Pressure of hydrogen = 761-7 + 9-3 — 17*4 . . . . = 753-6 
Temperature = 15-97° C. 
