/3 Rays from Radium by Solutions and Liquids. 613 



These results are clearly seen from Tables I. and II. 

 Table III. gives similar results for different thicknesses of 

 sodium chloride in the form of powder. Corresponding to 

 each concentration, the first column gives the thickness, t, of 

 the layer in cm., the second column the observed absorption, 

 a, in terms of cm. of aluminium, and the third column the 

 ratio of a/t. 



Table I. 



CaCl 2 Solution. 



Absorption in terms of Aluminium (cm.) tor 



various thicknesses and concentrations. 



Concentration... 3 gram-mol. 5 g.-mol. 7 g.-mol, 11*75 g.-mol. 



Thickness of 



layer of 



solution 



in cm. 



t. 



Absorption a, 

 in terms of 



cm. of 

 aluminium. 



a/t. 



a. 



a/t. 



•43 

 •43 

 •43 

 •43 

 •43 

 •43 



•43 



a. 



a/t. 



a. 



a/t. 



•12 cm. 



•14 



•16 



•18 



•20 



•21 



•0490 cm. of Al. 



•0569 



•0648 



•0726 



•0810 



•0854 



Mean . . . 



•41 

 •41 

 •40 

 •40 

 •40 

 •41 



•405 



•0517 

 •0604 

 •0686 

 0770 

 •0855 

 •0905 



•0552 

 •0653 

 0741 

 0824 

 0919 

 0970 



•46 

 •47 

 •46 

 •46 

 •46 

 •46 



•46 



•0635 

 •0740 

 0845 

 •0950 

 •1055 

 •1106 



•53 

 •53 

 •53 

 •53 

 •53 

 •53 



•53 



Table II. 

 C^H^On (Cane-Sugar) Solution. 



Concentration ... 1 Mol. 3 Mol. 5 Mol. 



t. 



a. 



a/t. 



a. 



1 

 a/t. 



a. 



a/t. 



•10 cm. 



•12 



•14 



•16 



•18 



•20 



•21 



0388 cm. of Al. 

 •0467 



0540 

 •0616 

 •0688 

 •0765 

 •0806 





39 

 39 

 39 

 39 

 38 

 38 

 38 



•0427 

 •0516 

 •0604 

 •0688 

 •0775 

 •0859 

 •0906 



•43 

 •43 

 •43 

 •43 

 •43 

 •43 

 •43 



•43 





0451 

 0546 

 0643 

 0732 

 0822 

 0918 

 0970 



•45 

 •46 

 •46 

 •46 

 •46 

 •46 

 •46 



•46 





39 







