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BIOLOGICAL SOCIETY OP WASHINGTON. 



Y. 



Page. 



Yarnall, Dr. J. H 20 



Yarrow, Dr. H C 20 



Yeates, Mr. W. S 20 



Yellow fever 27 



Yucca, fertilzation of 27 



Page. 



Zoological Record 32 



Zoologischer .lahresboricht 32 



Zoology, classification in 36 



Zumbrock, Dr. A 20 



Zufii biology 41 



