SEEDS AND SEEDLINGS. 



215 



now enlarges somewhat, as seen in the figures, and becomes the 

 bulb, or corm, of the baby jack. At first no roots are visible, 

 but in a short time one, two, or more roots appear on the 

 enlarged end. 



353. Section of an embryo. If we make a longisection of 

 the embryo and seed at this time we 

 can see how the club-shaped cotyle- 

 don is closely surrounded by the 

 endosperm. Through the cotyledon, 

 then, the nourishment from the en- 

 dosperm is readily passed over to the 

 growing embryo. In the hollow r part 

 of the petiole near 

 the bulb can be seen 

 the first leaf. 



Fig. 192- Fig. 193. Fig. 194. 



Seedlings of jack-in-the- Embryos of jack-in-the-pulpit still Seedling of jack-in- 



pulpit, first leaf arching out attached to the endosperm in seed the-pulpit; section of 



of the petiole of the coty- coats, and showing the simple first the endosperm and 



ledon. leaf. cotyledon. 



354. How the first leaf appears. As the embryo backs out 

 of the seed, it turns downward into the soil, unless the seed is 



