(92) 
Cus O, 
Conceutration in gr. Pw— ps Pm „Pops N 
mol per 1000 gr HO, in m.m He. in m.m. Heg. js Po nn 
0.02348 0.00086 0.037 0.6 
0.09860 0.00525 0.053 057 
0.24519 0.01585 0.065 0.78 
0.49378 | 0.03276 0.066 0.80 
0.99612 0.06790 0.068 0.820 
1.2162 0.09656 0.079 0.955 
| 
By concentration the number of gr. mol. CuSO, per 1000 gr. 
HO is represented. 
K NO, 
Concentration in er. | Pw — ps | pan | ig ti poe I 
mol. per 1000 er. HO. in mm. He. in mm. Hg. Eri Po u 
0.02051 0.00287 | 0.140 17 
0.25342 0.03241 0.130 1.54 
0.51074 0.05569 0.109 1.31 
1.0465 | 0.08671 | 0.083 0.996 
| | 
It appears from what precedes that of the examined compounds 
K NOs is the only exception with regard to its course. 
If the concentration of Hv SO, and Cu SO, increases, the molecular 
depression of the vapour tension, and also 7, becomes greater, whereas 
for KNO; the reverse takes place. 
It is remarkable, that the values for # of CuSO, always remain 
below unity, if we assume that there are in the solution CuSO, 
molecules, whereas the values for 7 calculated from the conductivity 
have been always found to be larger than unity. !) 
The most interesting result, however, is that of KNO,, for it 
shows that the course of NaCl ete. is probably not general. 
When I was occupied with these observations, Mr. Dirrerict*) 
') Prekrrrne, Berl. Ber. 25 pg. 1315, 1892. 
*) Wied. Ann. 62, pg. 616, 1897. 
anna: ne 
