985 



Diffusion of chloride of barium in 8*57 days at 63° ; two cells : — 



Grs. Ratio. 



From 1 per cent, solution 6'32 1*04?? 



From 2 per cent, solution 12*07 2 



From 4 per cent, solution 23*96 3*970 



From 8 per cent, solution 45*92 7*608 



Diffusion of chloride of strontium in 8*57 days at 63° ; 2 cells 



Grs. Ratio. 



From 1 per cent, solution 6*09 1*045 



From 2 pei^cent. solution 11*66 2 



From 4 per cent, solution 23*56 4'041 



From 8 per cent, solution 44*46 7'626 



Both the diffusates and ratios in the preceding table correspond 

 closely with those of chloride of barium. 



Chloride of Calcium. — The time for this and all the following 

 magnesian chlorides and nitrates was 11*43 days. 



Diffusion of chloride of calcium in 11*43 days at63°*8; two cells: — 



Grs. Ratio. 



From 1 per cent, solution 7*92 1*032 



From 2 per cent, solution 15*35 2 



From 4 per cent, solution 30*78 4*010 



From 8 per cent, solution 61*56 8*021 



On comparing solutions of chloride of calcium and nitrate of lime, 

 it appears that the correspondence between the 1 and 2 per cent, 

 solutions is sufficiently close, but that in the 4 and 8 per cent, the 

 salts diverge, as happens also with hydrochloric and nitric acids 

 themselves. The nitrate in both cases falls off, while the chloride 

 sustains throughout the high diffusibility of the lower proportions. 



Comparing certain other salts with chloride of calcium diffused at 

 the same temperature, 50°*8, the following are the results: — 



Chloride of calcium 6*51 100 



Chloride of manganese 6*63 101*85 



Nitrate of magnesia 6*49 99*69 



Nitrate of copper 6*44 98*92 



The following additional magnesian chlorides do not exhibit so 

 close a correspondence as the preceding : — 



Chloride of calcium 6*51 100 



Chloride of zinc 6*29 96*61 



Chloride of magnesium 6*17 94*77 



Protosulphate of iron 6*15 94*73 



Chloride of copper 6*06 93*08 



Sesquichloride of Iron. — A series of observations was made upon 

 the diffusion of the different proportions of this salt from 1 to 8 per 

 cent., but in all of them decomposition was determined by the diffu- 

 sion, with turbidity also in the solution phial except in the 8 per 

 cent, solution. 



The mean diffusion from the 8 per cent, solution, at 63°*3, was 



