42 



Photoiincroirniphs of Botiiiiiciil Studies. 



62. — Pollen from Male Cone of " Pinus sylvestris.' 



Fully developed pollen grains, 

 showing wing or air sac, taken 

 from mature cone. 



63. — L.S. Developing Ovule, " Pinus Sylvestris." 



■•'■•:• -^^t'r^ 





Integument. 

 Hndosperm. 



Spermo-nucleus. 

 Oonucleus. 



Wing of seed. 



