a a 
ae 
i pn 
es 
( 104 ) 
In this way I obtained from my experiments the results given 
in Table I (hydrogen considered as the solved substance). 
TiaAbil Bek 
a Bota 7g G,(l—*)+68,2| oe 
0 | 1.53985 | 1.5398 | 
0.9082 | 1.3057 | 1.8095 1.3183 0.2165 
0.30001) 1:2052 | 1.2080 | 1. 2206 | 0.3118 
0.4192 1.0826 1.0843 | 1.0938 | 0.4281 
0.5077 | 0.9884 | 0.9891 | 0.9997 | 0.5176 
0.6498 | 0.8399 | 0.8400 | 0.8485 | 0.6577 
0.7085. | 0.7799 | 0.7796 | 0.7850 | 0.7145 
1 | 0.4765 | 0.4759 | 
There is evidently a difference between the observed values (co- 
lumn 3) and the calculated ones (column 4), the difference amounts 
at the utmost to about 1 pCt.; when from the observed refracti- 
vity the composition (2’, column 5) is calculated, the difference 
amounts at the utmust to a unity in the 2™¢ decimal. So I consi- 
dered the method as suitable for the purpose. 
I hope soon to publish some further details about the difference 
found and the probable cause. 
Investigation of the vapour-mixtures. 
For the investigation of the vapour-mixtures an apparatus may 
be used of nearly the same construction as has been described above. 
The apparatus was modified only in so far that a branch-tube Q (fig. 2) 
with bulb P was added to tube B (fig. 1). The bulb was provided 
with a neck R with astopper S well ground in and closed by mercury. 
Two platinum wires, 7 and 7", passed through the stopper ; they were 
one m.m. in diameter and connected inside the bulb by a bent 
kruppin-wire U with an electric resistance of + 3 Ohm. The liquid 
or the mixture of liquids which was to be examined, was fused in 
a thin-walled glass tube, which was suspended in U; then the air 
1) The accuracy which might be expected of the 2nd mixture is smaller than that 
of the others on account of a deviation in the experiments. 
