1909.] 
NATURAL SCIENCES OF PHILADELPHIA. 
587 
Correspondents. 
January 19. — Albert Calmette, Ph.D., of Lille; John Mason Clarke, 
LL.D., of Albany; Sven A. Hedin, Ph.D., of Stockholm; Robert 
F. Scharff, Ph.D., of Dublin. 
November 16. — Oscar Drude, of Dresden. 
