Schaeffer: — Atmospheric Attenuation of Ultra-Violet Light. 



Plate 1. 



si9e 



T866 



TSSn 



Sfl7~ 



O 

 j3 . 



cu"3 

 O m 



CD O 



o2 



. 10 i 



til 



c 



■i« ?= S 



c S mC 



f-HSlic«=oii § 



o 

 a, 



10 



(M 



o 



ID 



O 



CO 



CO 



3 



O 



O 



CO 



e^er : 



Proc. Amer. Acad. Arts and Sciences. Vol. 57. 



