134 
THE FIRST BOOK OF BOTANY. 
tion of the structure of the embryo itself. If some 
seeds give uncertain appearances, wait till growth 
has proceeded a little further before you decide about 
them. By premature judgments you may fill your 
note-book with errors which you will be compelled to 
erase. 
EXERCISE XLY. 
Monocotyledons and Dicotyledons . 
A MonocotyledOnous embryo has one cotyledon 
or seed-leaf (Fig. 228). 
A Dicotyledonous embryo has two cotyledons 
or seed-leaves (Fig. 229). 
These are long, hard words, hard to pronounce, 
and hard to spell. But they are very necessary words 
in describing seeds. You can soon learn them. 
Go over the seeds you have planted, and point out 
