THE AMERICAN 



MONTHLY 



Microscopical Joirxal 



/ CONTAINING 



CONTRIBUTIONS TO BIOLOGY, 



VoLaUMEI XIV. 



FOR 



1893. 



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



PUBLISHED, SINCE 1887, BY CHAS W. SMILEY, 



WASHINGTON, D. C. 



