266 Prof. Graham on the Diffusion of Liquids. 



The diffusion product was obtained by evaporating the 

 water of each jar separately as before, and the result is ex- 

 pressed in grains. 



It will be observed at once, on comparing the means of the 

 experiments, that the three salts under consideration are re- 

 markably similar in their diffusion, particularly with the smaller 

 proportions of salt. Thus the mean diffusion of the 2, 4, 6§ 

 and 10 parts of the salts is as follows: — 



Diffusion at 64°-2. 





2. 



4. 



6§. 



10. 



Carbonate of potash ... 



Sulphate of potash 



Sulphate of ammonia... 



5-45 

 5-52 



5-58 



10-25 

 10-57 

 10-51 



16-67 

 17-17 

 16-79 



24-69 

 23-62 

 22-20 



Diffusion at 37°'6. 





2. 



4. 



6|- 



Carbonate of potash 



3-85 

 3-95 

 3-76 



7*09 

 7-40 

 7-70 



11-25 

 11-66 

 10-96 



Sulphate of potash 



Sulphate of ammonia 





The proportions diffused are sensibly equal, of the different 

 salts, at the higher temperature, with the exception of the 

 largest proportion of salt, 10 per cent., when a certain diver- 

 gence occurs. This last fact is consistent with our expecta- 

 tions, that the diffusion of salts would prove most highly 

 normal in dilute solutions. Some of the irregularities at the 

 lower temperature are evidently of an accidental kind. 



(2.) The neutral chromate and acetate of potash were dif- 

 fused at a temperature ranging from 63° to 65°, or at a mean 

 temperature of 64°-l, which almost coincides with the higher 

 temperature of the last experiments. 



