PLATE 60 

 A. — Normal pollen. 



B. — Bulging of the inline through imbibition. 

 C. — The effect of free water when the intine is not ruptured. 



D.— Pollen germinating on a stigma hair; the pollen grain loosened so as to show the 

 tube. 



E. — Germinating pollen. 

 F, G.— Pollen tube. 



