72 



Grs. 



Sulphate of potash at 60°*3 (as above)... 11-60 



Sulphite of potash at 59°'5 11*63 



Sulphite of soda at 59°-6 11-83 



Hyposulphite of potash at 59°-8 12-37 



Hyposulphite of soda at 59°*9 11-89 



Suiphovinate of potash at 59°-8 12-60 



Sulphovinate of soda at 59°-6 13*03 



Tartrate of potash at 59°'9 10-96 



Tartrate of soda at 59°-6 1 0-65 



Carbonate of potash at 59°-9 10-73 



Carbonate of soda at 59°-6 10*65 



Diffusion of oxalate of potash in 8*083 days at 59°'9 : two cells. 



Grs. Ratio. 



From ] per cent, solution 6*20 1*019 



„ 2 „ „ 12*17 2* 



„ 4 „ „ 23*04 3*789 



„ 8 „ „ 42-82 7*042 



The oxalate of potash corresponds closely with sulphate of potash.. 

 The diffusion from the 1 per cent, solution of oxalate of soda at 

 59°*9, gave 6*24 grs. in 9*875 days, or a nearly equal diffusate to 

 that of the oxalate of potash. 



Diffusion of acetate of potash in 8*08 days at 60°'3 : two cells, 



Grs. Eatio. 



From 1 per cent, solution 6*44 1*028 



„ 2 „ „ 12-52 2- 



„ 4 „ „ 23-44 3*744 



„ S „ 47*26 7*549 



The acetate is found to exceed sensibly the sulphate and oxalate 

 of potash in diff'usibility, at the preceding temperature. 



Diffusion of acetate of soda in 9*87 days at 59°*6 : two cells. 



Grs. Ratio. 



From 1 per cent, solution 6*67 1*070 



., 2 „ „ 12*46 2* 



,, 4 „ „ 25*04 4*019 



„ 8 „ „ 48*04 7*711 



The diffusion of acetate of soda presents a general parallelism to 

 that of acetate of potash for the times chosen, the temperatures of 

 the two series of experiments differing only 0*7 degree. 



The salts of potash and soda of the sanie base appear therefore 

 to give approximately equal amounts of diffusate, when diffused for 

 the two different times chosen, with the remarkable exception of the 

 hydrates of these two bases. The relation is most observable in the 

 small proportions of salt, or weak solutions, such as the 1 and 2 per 

 cent, solutions. The soda salts, as a general rule, fall off' in difFusi- 

 bility in tlie higher proportions as compared with potash salts. 



The double tartrate of potash and soda was observed to undergo 

 decomposition in diff usion, the tartrate of potash separating from the 

 tartrate of soda from the higher diffusibility of the former. 



Ratio. 



100* 



100*26 



101*72 



106-44 



101*10 



108*62 



