CHAPTER XIII 



THE FORMATION AND DEVELOPMENT OP SEED 



As soon as the sperm cell from the pollen tube and the 

 egg cell in the ovule have united as explained in Section 

 90, the development of the seed begins. 



Fig. 39. — How food travels from the leaves to the seed. 



92. How the Food is stored in the Seed. — We have 

 noted how starch is formed in the green leaves (Sections 



117 



