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. 



