70(j 



INDEX 



x 



Xenia hicksoni, 9 

 Xenopus la vis, 20 sqq. 



Y 



Yak, 49 



Yolk-sac, 378 ; nutritive 



ance of, 380 sqq. 

 Yule, 621 

 Youatt, 334 

 Yung, 625 



Zaeharjewsky, 497 sq., 503, 505 sq., 



510 



Ziegler, 641 

 Zoarces, 151 

 import- i Zoth, 309 



Zuntz, L., 68, 355 



- E., 519 

 Zweifel, 505 

 Zweifel and Abel, 346 



Printed by BALLANTYNK, HANSON & Co. 

 Edinburgh & London 



