Sanger and Black.— Arsenic by Gutzeit Method. 



r 1. 



2 5 10 15 20 25 30 35 40 50 60 70 



Fig. 1. 



Standard Arsenic Bands in Micromilligrams of As 2 3 



Initial. 



ri m 





5 10 15 20 



25 30 



Fig. 2. 



35 40 50 60 70 



Standard Arsenic Bands in Micromilligrams of As E a 

 Hydrochloric Acid Development. 



Proc Amer. Acad. Ari 



iences. Vol. XLIII. 



