L6 VS. <^ ^ 



THE AMERICAN 



MONTHLY 



Microscopical Journal 



CONTAINING 



CONTRIBUTIONS TO BIOLOGY. 



Volume XI. 



FOK 



1 890. 





FOUNDtD IN 1880, bV HOMVn HITCHCOCK, F. R. M. S, 



PUBLISHtD. SINCE 1887. BY CHAS. W. SMILEY. 



WASHINGTON, D. C. 



