THE CARRIERS OF THE HERITAGE 25 



Rg.15. Entry of Sperm Rg,J6. Loss of SpermT&ll Rg.17. Division of Cenlrosojne 



fi.16. Approach of Spero f^.ia Increase of Sperm fig.20. Formation of 



Nucleus Nucleus Chromosomes 



F7&2.1. Splitting of Chromosomes H. 22. Anaphase 



. Two-celled Sta^e 

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



