224 
PROFESSOR GRAHAM ON OSMOTIC FORCE. 
The membrane preserved a considerable action after the last experiments, although 
macerated in water for a night, and imparted thereafter to a salt nearly neutral to 
osmose (nitrate of silver), a rise of 222 and 166 ms. 
In albumen, pernitrate of mercury again was low, giving 32 and 54 ms. for one 
per cent, of the salt, and 34 and 46 ms. for the one-tenth per cent, solution. 
Silver . — It is interesting to observe how this metal separates itself from mercury 
and the magnesian elements, and takes its place with the alkaline metals in the pro- 
perty of osmose, as in other chemical characters. Nitrate of silver appeared to 
possess a moderate positive osmose, like a salt of potash or soda. For the sake 
of comparison, the silver salt was followed by nitrate of soda in the experiments 
below. 
Table XXIX. — Solutions in Osmometer G of double membrane for five hours. 
Salt in osmometer. 
Rise in 
millimeter 
degrees. 
Previous 
maceration. 
Hydrostatic 
resistance. 
Temperature, 
Fahr. 
1 per cent, of nitrate of silver 
36 
days. 
1 
min. 
2 
64 
Same 
34 
1 
2 
65 
O’l per cent, of nitrate of silver 
27 
1 
2 
62 
Same 
22 
1 
2 
64 
1 per cent, of nitrate of soda...... 
7 
2 
2 
61 
Same 
2 
1 
2 
64 
The experiments of the Table indicate an average osmose of 35 ms. for 1 per cent, 
of nitrate of silver, and of 4*5 ms. for the same proportion of nitrate of soda. A 
considerable diffusale of silver appeared in all the experiments with the salt of that 
metal. 
Gold and Platinum . — The chlorides of these metals have already been shown to 
possess a decided negative osmose, and in that respect to rank with acids. 
In concluding this paper, I may place together a series of numerical results which 
exhibit the osmose of substances of all classes. Some of these numbers have not 
been previously reported. 
