972 
This circumstance brought, however, no change in our plan, 
as it was our purpose to study the influence of the temperature 
on the shape of the curve of viscosity in the system H,O—SO,. 
It is seen from the subjoined 7—X figure of the system H,O—SO,, 
which is not yet quite completed, that at 15° the tops of the compounds 
H,SO,.H,O and H,SO, are passed at temperature distances of 6.47°, 
resp. 4.65°. 
Fig. 2. 
The compounds H,SO, . 2 H,O and H,SO, . 4 H,O are, indeed, 
also passed, but the melting-points of these compounds lie so far 
below 15° (—38.9° resp. —25°) that it is not to be expected that the 
