JHE AMERICAN 



MONTHLY 



Microscopical Journal: 



VCONTAINING 



CONTRIBUTIONS TO BIOLOGY 



VoLaUMR XVI 



FOR 



189S. 



FOUNDED IN 1880, BY ROMYN HITCHCOCK. F. R. M. S. 



PUBLISHED. SINCE 1887, BY CHAS. W. SMILEY. 



WASHINGTON. D. C 



