110 



BIOLOGICAL SOCIETY OF WASHINGTON. 



Page. 



Yarnall, Dr. J. H 20 



Yarrow, Dr. H C 20 



Yeates, Mr. W. S 20 



Yellow fever 27 



Yucca, fertilzation of 27 



Z. 



Page. 



Zoological Record 32 



Zoologischer Jahresbericht 32 



Zoology, classification in 35 



Zumbrock, Dr. A 20 



Zufii biology 41 



