BY MEANS OF THE RADIOMICROMETER. 



21 



and the scale can be accurately read; we see that for potassium chloride 

 the difference between the percentage transmission for the solution and 

 for the solvent is only 1 part in 23, whereas for magnesium chloride, 

 figure 1, it is nearly 7 parts in 26, or a difference of about 25 per cent. 

 Table 6 brings out another point of considerable interest. If we 

 consider the center of the lju band, which is the region of maximum 

 absorption, it will be seen that for potassium chloride the solution 



TABLE 6. Depth of cell 20 mm. Magnesium and potassium chlorides. 



