834 
PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
gave 14'98 grs. for one cell. Calculated for 4 per cent., 13'50 grs. of bicarbonate of 
ammonia in one cell. 
4. 8‘872 per cent, of bicarbonate of ammonia, density 1 •03856, diffused at 68°'2, 
gave 27*78 grs. for one cell. Calculated for 8 per cent., 25'05 grs. of bicarbonate of 
ammonia in one cell. 
Diffusion of Bicarbonate of Ammonia in 8*08 days at 68°"2 ; two cells. 
Grs. Ratio. 
From 1 per cent, solution 6'91 1’013 
From 2 per cent, solution 13*65 2 
From 4 per cent, solution 27*00 3*959 
From 8 per cent, solution 50*10 7*346 
The amount and progression of the diffusion of this salt correspond well, for all 
the proportions diffused, with the preceding isomorphous bicarbonate of potash. 
39. Bicarbonate of Soda. 
Time of diffusion 9*875 days. The usual number of eight cells of the 1 and 2 per 
cent, solutions were diffused, and four cells of the 4 and 8 per cent, solutions. The 
whole diffusates of each proportion were then mixed together, and the quantity of 
bicarbonate of soda, diffused for two cells, converted into chloride of sodium, evapo- 
rated to dryness and weighed. 
1. 1*135 per cent, of bicarbonate of soda, HO . COg+NaO . CO2, density 1*00892, 
diffused at 68°*l,gave 8*30 grs. for two cells. Calculated for 1 per cent., 7*31 grs. of 
bicarbonate of soda in two cells. 
2. 2*27 per cent, of bicarbonate of soda, density 1*01703, diffused at68°*l,gave 15*68 
grs. for two cells. Calculated for 2 per cent., 13*81 grs. of bicarbonate of soda in two 
cells. 
3. 4*54 per cent, of bicarbonate of soda, density 1*03306, diffused at 68°*1, gave 15*16 
grs. for one cell. Calculated for 4 per cent., 13*35 grs. of bicarbonate of soda in one 
cell. 
4. 9*08 per cent, of bicarbonate of soda, density 1*06386, diffused at 68°*1, gave 29*73 
grs. for one cell. Calculated for 8 per cent., 26*19 grs. of bicarbonate of soda in one 
cell. 
Diffusion of Bicarbonate of Soda in 9*87 days at 68^*1 ; two cells. 
Grs. 
Ratio. 
From 1 per cent, solution .... 
7*31 
1*059 
From 2 per cent, solution .... 
. 13*81 
2 
From 4 per cent, solution .... 
. 26*70 
3*869 
From 8 per cent, solution .... 
. 52*38 
7*590 
A remarkable approach to equality in the diffusion of the bicarbonates of potash 
