IN THE PRESENCE OF STRONGLY HYDRATED SALTS. 



51 



dilute than for the more concentrated solutions; this is what would be 

 expected in terms of the solvate theory applied to the phenomenon in 

 question. 



Considerable work was done in comparing directly the transmission of a 

 solution and that of water having the same depth as the water in the solu- 

 tion in question. The deflection of the radiomicrometer as given by the 

 solution is in the column marked " Deflection of solution," and the deflection 

 as given by water having the same depth as water in the solution is given 

 in column "Deflection of water." 



Table 11. 



The results obtained for aluminium sulphate having a concentration 

 1.02 N, and for potassium chloride 4 N are given in table 11. The depth 

 of solution used was 20 mm., and the depth of water that of the water in the 

 solutions in question. 



Duplicate measurements were made with the radiomicrometer for nearly 

 every solution of all the substances worked with at the various wave-lengths 

 studied. It was found that readings for the different solutions of the same 

 substance having the same concentration were, for a given wave-length, 

 different from one another to the extent of somewhat less than 2 per cent. 

 From this it seems fair to assume that the error in our work was not greater 

 than 2 per cent. 



