822 
PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
1. 1*012 per cent, of anhydrous sulphate of magnesia, density 1*0108, diffused at 
65°*4, in eight cells, 7'34, 7'66, 7'43, 7’ 18; mean 7'40 grs. for two cells; calculated 
for 1 per cent., 7’31 grs. of sulphate of magnesia in two cells at 65°*4. 
2. 2*024 per cent, of sulphate of magnesia, density 1*02089, diffused at 65°*4, in 
eight cells, 12*91, 13*13, 12*83, 12*93; mean 12*95 grs. for two cells; calculated for 
2 per cent., 12*79 grs. of sulphate of magnesia in two cells at 65°*4. 
3. 4*048 per cent, of sulphate of magnesia, density 1*04033, diffused at 65°*4, in 
four cells, 12*06, 12*56, 10*63, 12*24; mean 11*87 gfs. for one cell; calculated for 
4 per cent., 11*73 grs. of sulphate of magnesia in one cell at 65°*4. 
4. 8*096 per cent, of sulphate of magnesia, density 1*07830, diffused at 65°*4, in four 
cells, 22*25, 20*56, 21*80, 22*06; mean 21*67 gi’S. for one cell; calculated for 8 per 
cent., 21*41 grs. of sulphate of magnesia in one cell at 65°*4. 
5. 8*07 per cent, of sulphate of magnesia, density 1*07830, diffused at 62°*8, in four 
cells, 21*12, 21*20, 22*13, 21*77 ; mean 21*55 grs. for one cell; calculated for 8 per 
cent., 21*33 grs. of sulphate of magnesia in one cell at 62°*8. 
6. 16*14 per cent, of sulphate of magnesia, density 1*15054, diffused at 62°*8, in four 
cells, 37*08, 38*39, 38*65, 37*50 ; mean 37*90 grs. for one cell; calculated for 16 per 
cent., 37*53 grs. of sulphate of magnesia in one cell at 62°*8. 
7- 24*22 per cent, of sulphate of magnesia, density 1*21882, diffused at 62°*8, in 
four cells, 49*38, 50*40, 53*36, 53*00; mean 51*53 grs. for one cell; calculated for 
24 per cent., 51*02 grs. of sulphate of magnesia in one cell at 62°*8. 
Diffusion of Sulphate of Magnesia in 16*16 days at 65°*4 ; two cells. 
From 1 per cent, solution .... 
Grs. 
7*31 
Ratio. 
1*144 
From 2 per cent solution .... 
12*79 
2 
From 4 per cent, solution .... 
23*46 
3*671 
From 8 per cent, solution .... 
42*82 
6*701 
From 8 per cent, solution at 62°*8 
42*66 
1 
From 16 per cent, solution at 62°*8 
75*06 
1*759 
From 24 per cent, solution at 62°*8 
102*04 
2*340 
28. Sulphate of Zinc. 
Time of diffusion 16*166 days. The diffused salt was evaporated to dryness and 
weighed. 
1, 1*001 per cent, of anhydrous sulphate of zinc, density T01093, diffused at 65°*4, 
in eight cells, 6*66, 6*76, 6*51, 6*80; mean 6*68 grs. for two cells; calculated for 1 
per cent., 6*67 gi’s. of sulphate of zinc in two cells at 65°*4. 
2. 2*002 per cent, sulphate of zinc, density 1*02120, diffused at 65°*4, in eight cells, 
12*16, 12*19, 12*52, 12*05; mean 12*23 grs. for two cells; calculated for 2 per cent., 
12*22 grs. of sulphate of zinc in two cells at 65°*4. 
