Ultra- Violet Light by Dilute Solutions. 711 



2. The accompanying figure shows the results of experi- 

 ments on solutions of sodium chloride for varying concen- 

 trations, using two thicknesses of absorbing solution. The 



Fio-. 1. 



9 



<7 



•6 

 •5 



a 

 13 



K 





















\\ 





















V 



V 































■ *oo„, 





















VOO/OA, 





'a? - 



^2^_ 





















^J~MjT 























- 





















5 10 15 20 2b 50 35 40 fl-5 50 



X Sodium Chloride . CoA/C£A/T/?/rr/o/v /a/ A/okm/h. */o~* 



ordinate represents the ratio of the electrometer deflexion to 

 that produced in the same time when the light passed 

 through the same thickness of distilled water. The actual 

 figures are given below. 



Sodium Chloride. 



Concentration 

 in 10 -4 normal. 



Thickness 

 15 mm. 



Thickness 

 7'5 mm. 



25 



•940 



•750 



5 



•795 



•677 



10 



•680 



•639 



20 



■639 





25 





•580 



30 



•G04 





50 



•531 



•500 



100 



•372 





200 



•350 





The case of potassium bromide is particularly interesting 



