Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLIII. No. 9. — October, 1907. 



CONTRIBUTIONS FROM THE CHEMICAL LABORATORY OF 

 HARVARD COLLEGE. 



LIBRARY 

 NEW YORK 

 BOTANICAL 



GARDEN. 



THE DETERMINATION OF ARSENIC IN URINE. 



By Charles Robert Saxgeb a.\d Otis Fisher Black. 



