THE CARRIERS OF THE HERITAGE 25 



fiig.18. Approach of Sperm 

 Nucleus 



Pig.lS. Entn^ of Sperm Ff^lG. Loss of Sperm Tall R^.IZ Division of Cenlrosome 



f?g. 19, Increase of Sperm Fi^.ZO. Formation of 

 Nucleus Chromosomes 



Fi*g.2.I. Splitting of Chromosomes H^. £2. Anaphase 



n^.SS.Two-celled Sla^e 

 Figs. 15-23. — Diagrams illustrating fertilization. After Boveri. 



