XJf 



SPECTRUM ANALYSIS. 

 P' IE 



287 



C JJ a A 



Ba 



Tl 



Fig. 107. 



you see the accuracy of the analysis is all that can be 

 desired. 



We have referred to the delicacy of this method of anal- 

 ysis. This delicacy varies with different substances ; of so- 

 dium, the one three-millionth of a milligramme ( 3>ow>( ! w>OU u 

 gramme) can easily be detected. Sodium in some shape, 

 combined with chlorine chiefly, is always present in the 



