THE PARTS OF THE SEED 19 
Is this the embryo of the bean plant? The pointed 
end is the root, and we see that it lies in such a position 
that when it begins to grow it will come 
through the seed coat near the scar on 
the bean. 
At the other end of the plantlet are 
eae pe two tiny leaves, pointed, and set some- 
split open toshow thing like the letter V. We know that 
ae they are leaves because there are veins 
on them like the veins on the leaf. Between these 
leaves and the pointed end or root lies the stem. It 
is short and stout, and there is no distinct 
dividing line between it and the root. Root (\) 
and stem in the embryo are called the cau-li- 
cle. The upper end of the stem just below spices a 
the tiny leaves is joined to the cotyledon, showing situa- 
one cotyledon breaking away as the bean ak ae 
was split open. Zhe part of the stem below the coty- 
ledons, that is, the part between them and the root, 1s 
called the hy'po-cot-yl. 
The parts of the pea seed. The position of 
the plantlet can be seen on one side of the 


/ rounded pea, below the scar, after the pea has 
rre.3¢ been soaked in water. By a slight rubbing 
Marrow seed. yressure between the thumb and finger the 
thin seed coat can be slipped off. The two thick 
cotyledons can now be separated. If this is done 
