214 
PROFESSOR GRAHAM ON OSMOTIC FORCE. 
osmose will be found below to be considerable, although the specimen of salt 
employed was strictly neutral to test-paper. 
This salt also, like sulphate of potash, is shown not to counteract the high positive 
osmose of an alkaline carbonate. 
The chromate of potash, although carefully purified by crystallization, retained a 
slight alkaline reaction. On this account small additions were made to it of bichro- 
mate of potash in some experiments, but without materially diminishing the very 
sensible positive osmose of the former salt. A neutral chromate has of course the 
same bibasic character as a sulphate. 
Table XX. — Oxalate and Chromate of Potash in Osmometer F of double mem- 
brane for five hours. 
Solution of salt. 
1 per cent, oxalate of potash 
Same 
0*1 per cent, oxalate of potash 
Same 
1 per cent, oxalate of potash + O’] per cent. 
carbonate of potash 
Same + same 
0-1 per cent, carbonate of potash 
Same 
Rise in 
millimeter 
degrees. 
164 
153 
92 
90 
Diffusate in Previous 
grammes. maceration. 
days. 
1 
1 
1 
2 
Hydrostatic 
resistance. 
min. 
11 
10 
5 
6 
Temperature, 
Fahe. 
65 
65 
63 
61 
8 
5 
56 
337 
322 
273 
1 
1 
1 
5 
3 
3 
60 
62 
68 
1 per cent, oxalate of potash + 0-1 per cent. 
carbonate of potash 
Same + same 
1 per cent, bichromate of potash 
Same 
1 per cent, chromate of potash 
Same 
1 per cent, chromate of potash + 0-1 bichro- 
mate of potash 
Same 
294 
246 
24 
19 
109 
106 
91 
79 
0-253 
0-318 
0-326 
0-307 
0-298 
0-281 
1 
2 
1 
2 
1 
1 
2 
1 
3 
3 
3 
1 
1 
1 
1 
1 
62 
55 
54 
56 
62 
58 
57 
60 
The average rise for the 1 per cent, solution of each of the salts placed in the osmo- 
meter in a pure state is, bichromate of potash 2T5 ms., chromate of potash 107‘5 ms., 
and oxalate of potash 158‘5 ms. The average diffusate for the chromate of potash is 
0 - 3165 gramme, and for the bichromate of potash 0 - 2855 gramme. 
Like solutions were submitted to osmose at the same time in a septum of albu- 
men for the sake of comparison with the preceding membrane osmometer. 
