THE CARRIERS OF THE HERITAGE 25 



fj&1&. Approach of Spent 

 Nucleus 



Fig.15. Entry of Sperm Fi4,16. Loss of Spsrm Tail Flo,!?. Division of Centrosone 



j.ia Increase of Sperm Fig. 20. Formation of 

 Nucleus Chromosomes 



Fi.2.1. Splitting of Chromosomes FJ. ZZ. Anaphase 



Fi.23. Two-celled Staple 

 FIGS. 15-23. Diagrams illustrating fertilization. After Boveri. 



