A Handbook of Nebraska Grasses. ) 
The fruit of grasses is called a caryopsis, having the pericarp 
and seed coat intimately united. The embryo lies in contact 
with the endosperm (fig. 9, A) by means of its cotyledon. The 
part of the cotyledon next to the endosperm is the seutellum 
(fig. 9. ©), serving as an absorbent organ in germination. The 
starch, oil, and protein of the endosperm and embrvo render the 
fruit of grasses of high economic value. 

Fig. 8. 
DIRECTIONS FOR USE OF THE KEYS. 
A good hand lens will be found a necessity in the study of the 
grasses. The beginner should carefully study the statements 
under “Structure of Grasses” (p. 6). With a specimen of the 
grass before him he is then ready to begin the work of identifi. 
eation. As an illustration we may select the awnless brome 
grass, Bromus inermis. 
We begin with the “Tribe Key to the Grasses” (p. 11). At 
the top of the page are found three lines, each describing a cer- 
