212 SCHOOL AND HOME GARDENS 
In a grain of corn the lower part of the embryo, 
located near the hilum, is called the radicle. The plu- 
mule is the upper part of the embryo, and the single 
Endosperm 
Cotyledon 
Zn 
Oa Caruncle 
Fic. 115. Castor Bean with One 
Half of the Endosperm and One 
Cotyledon cut away 
cotyledon lies next to the 
endosperm, which constitutes 
a large part of the grain of 
corn (see Fig. 116). 
Soak beans, castor beans, 
corn, and several other kinds 
of seeds. Examine the seed 
coats and compare them. Find 
the embryo in each. If the 
seeds contain endosperm, lo- 
cate it with reference to the 
cotyledons. 
Kinds of seeds. As the seeds mature during summer 
and fall, the names of the different kinds of seeds may 
be learned while gathering 
samples. Place the seeds in 
envelopes and write the name 
of each kind on the envelope 
that contains it. Envelopes 
that have been used will do; 
they may be closed by folding 
over the open ends. 
Endosperm_| 
Fie. 116. A Grain of Corn cut 
Lengthwise 
Seed board. A convenient device for learning the 
names of seeds is a seed board, shown in Fig. 117. 
The dimensions of the board may vary. Make the 
holes one inch in diameter, half an inch deep, and half 
