148 



INDEX AND GLOSSARY 



absence of proof for differ- 

 entiating division, 34 ; sym- 

 metry of egg and adult, 55 ; 

 immortality of germ-cells, 

 17, 80, 82 ; germ-tracks, 83 ; 

 doubling division, 102 ; con- 

 troversy with Spencer, 125. 



Willow, reproduction from 

 slips, 46. 



WILSON, separation of seg- 



mentation spheres of am- 



phioxus egg, 60. 

 WOLFF, Theoria Generationis , 



4. 

 Wounds, healing of, in relation 



to idioplasm, xii. 



Yolk, nutritive material stored 

 in an egg- cell, xvi. 





THE END. 



BILLING AND SONS, PRINTERS, GUILDFORD. 



