THE AMERICAN 



MONTHLY 



Microscopical Journal: 



CONTAINING 



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 



