PLATE 11 



EXPLANATION OF FIGURES 



76 Section of a tertiary mass which has divided up into a number of com- 

 ponents. In some of the components the embryonic cells are being isolated 

 through the activity of the inner membrane. Such cells will produce sexual 

 embryos. X 700. 



77 A late stage in the development of a tertiary mass, showing early stages 

 in the formation of sexual embryos. X 700. 



78 An advanced stage of the development of the sexual embryos. X 110. 



66 



