PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
825 
3. Nitrate of silver, r967 per cent. ; density 1*01696. Diffusion at 63°‘41, in eight 
cells, 13’85, 13*29, 13*70, 12*73 ; mean 13*39 grs. for two cells ; calculated for 2 per 
cent., 13*61 grs. at 63°*4 for two cells. 
4. Nitrate of silver, 3*93 percent.; density 1*032. Diffusion at 63°*4, in four cells, 
13*27, 12*70, 12*90, 12*90 ; mean 12*94 grs. for one cell ; calculated for 4 per cent., 
13*17 grs. at 63°*4 for one cell. 
5. Nitrate of silver, 7’88 per cent. ; density 1*066. Diffusion at 63°*4, in four cells, 
26*45,25*49, 24*57, 25*73; mean 25*56 grs. for one cell; calculated for 8 per cent., 
25*94 grs. at 63°*4 for one cell. 
A rise of 10°*4 of temperature, or from 53° to 63°*4, increases the diffusibility of this 
salt from 11*24 to 13*61, or from 100 to 121*2; which is an increase of 2*04 per cent, 
for 1°. 
Diffusion of Nitrate of Silver for seven days at 63°*4 ; two cells. 
Grs. 
Ratio. 
From 2 per cent, solution . . . 
. 13*61 
2 
From 4 per cent, solution. . . 
. 26*34 
3*87 
From 8 per cent, solution . . . 
. 51*88 
7*62 
31. Nitrate of Soda. 
Time of diffusion seven days. The quantity of salt diffused was ascertained by 
evaporation to dryness. 
1. Nitrate of soda, 1*987 per cent. ; density 1*0130. Diffusion at 53°, in eight cells, 
11*37, 10*44, 10*76, 10*40; mean 10*74 grs. for two cells ; calculated for 2 per cent., 
10*81 grs. for two cells. 
2. Nitrate of soda, 1*998 per cent. Diffusion at 63°*4, in eight cells, 12*53, 12*38, 
12*39, 12*06 ; mean 12*34 grs. for two cells ; calculated for 2 per cent., 12*35 grs. for 
two cells. 
3. Nitrate of soda, 3*98 per cent. ; density 1*027. Diffusion at 63°*4, in four cells, 
12*21, 11*32, 12*10, 11*31; mean 11*73 grs. for one cell; calculated for 4 per cent., 
11*78 grs. for one cell. 
4. Nitrate of soda, 7‘96 per cent. ; density 1*053. Diffusion at 63°*4, in four cells, 
24*96, 22*53, 23*16, 24*38; mean 23*76 grs. for one cell; calculated for 8 per cent., 
23*87 grs. for one cell. 
A rise of temperature from 53° to 63°*4 increases the diffusibility of nitrate of 
soda from 10*81 to 12*35, or from 100 to 114*3, which is an increase of 1*37 per cent, 
for 1°. The increase on the nitrate of silver for the same rise of temperature appeared 
to be considerably greater, namely, 2*04 per cent, for 1°. 
5 N 
MDCCCL. 
