(91) 
CANE SUGAR. 
Concentration in gr. 
mol, per 1000 gr. H,0. 
Pw Ps 
in mm. He. 
k Pm 
in mm. He, 
0.02602 0.00219 0.084 1.0 
0.17225 0.01479 0.086 1.03 
0.45413 0.03972 0.087 1.05 
1.0811 0.09074 0.090 1.08 
These few determinations were sufficient to prove that for Na Cl, 
KOH and cane sugar the molecular depression of the vapour tension, 
and so #, increases with the concentration. 
The second series of KOH solutions is more reliable than the first, 
because great care has been taken to keep the second series of solu- 
tions free from carbonic acid. Probably this is the reason, that the 
values for d in the second table of solutions of KOH are a little 
higher than in the first. 
The second table of solutions of cane sugar is also more accurate 
than the former, because the temperature of the waterbath in which 
the manometer is placed, was about 10° lower in the second series 
than in the first. At a lower temperature the accuracy is greater, 
because the manometer then reaches its position of equilibrium sooner 
than at a higher temperature. 
It is evident that it is not much use to calculate the value for # 
for concentrations above 1 gr. mol. per 1000 gr. water. Nevertheless 
this calculation has been made here to facilitate a comparison with 
my former observations. 
After this repetition of my former observations, experiments were 
made with solutions of the following substances: 
Horo oO. HSO and KONO; 
The results are given in the following tables. 
HH; S QO, 
——— — a : = 
Concentration in gr. | Pups | Pm Fe Pope N 
mol. per 1000 gr. H,O in mm. He. | in mm. Hg. | Ahr Pare 
0.02090 0.00336 | 0.161 | 1.9 
0.04968 0.00819 0.165 2.0 
0.24960 0.04204 0.168 2.03 
0.50418 0.08713 0.173 2.08 
1.11431 0.21057 0.184 2.215 
2.1795 0.44246 0,203 2.441 
