SuALiiWOOD. — Maturation Hamiuea. 



PLATE 9. 



Fig. 58. The young achromatic figure still partly surrounded by the bounding wall 

 of the parent centroplasm. Old astral rays disappearing; new astral 

 rays few, but prominent. Boundary between cortical and medullary 

 portions of sphere-substance still visible on' one side of the figure. 

 Iron haematoxylin. X 1224. 



Fig. 59. The deep (egg) chromosomes have passed into the telophase, although 

 the second polar cell has not yet been formed. Brazilin. X 1224. 



Figs. 60-64. Show the approach of the spermatozoon and migration of the sperm 

 head after penetrating the egg. Sperm nucleus becomes vesicular. 

 Delafield's haematoxylin and picric acid. X 1680. 



