22 THE GROWTH AND PARTS OF PLANTS 
through this groove. Just underneath the seed coat at 
the small end will be seen the end of the root and stem 
groove there may be seen several converg- 
@ \ (caulicle). Near the other end of the 
ing lines running as shown in Fig. 44, 
Fic. 43. Cross sec- 
tion of sunflower These lines represent several leaves cut 
seed at left; at : . 
right,sideviewot lengthwise while they are rolled round 
embryo taken 
from seed. each other. The stem lies between the — 
leaves and root; it is now very short, and cannot be 
distinguished from the root. On the opposite side of 
‘ Fic. 44. Section of maize seed ; at upper 
There is only one cotyledon right of each is the plantlet, next the 
cotyledon, at left the endosperm. 
the stem from the groove is 
a small curved object. This 

is the cotyledon cut through. 
in the maize seed, while in 
the other seeds studied there are two. 
The meat in the maize seed. In the pea, bean, mar- 
row, and sunflower seeds the cotyledons form nearly all 
the whole seed inside the seed coat in these 
plants, except the papery lining, is the 
Fic. 45. Long sec 
ia oe vee embiyo, for the cotyledons, being the first 
waeat seed leaves, are part of the tiny embryo plant. 
showing oneview 
a EE We have found something very different 
endosperm. § In the maize. The embryo is only a small 
part of the inside of the seed. After the seed has 
germinated, the food substance is still there. Did you 
(ti the meat inside the seed coats. In fact, 


