A hsorption Spectra of Dilute Solutions. 



153 



Table II. 



The letters have the following significations : 



c = concentration of the solution in gram-molecules per litre. The molecular 

 weight used is given after the formula of the substance. 



I = length of the layer of solution. 

 T = light transmitted by the tube of solution. 



e = extinction coefficient for 1 cm. of solution containing 1 gram-molecule per 

 litre. 



