CHAP. I SEEDS 7 



2. The lower firmer portion, the embryo. 



3. The upper softer, more mealy portion, the endosperm, or 



food stored away for the use of the embryo when it 

 begins to grow. This part of the kernel of the Corn 

 is lacking in the Pea and the Bean, where the food for 

 the use of the embryo is all stored away in the thick- 

 ened cotyledons. 



4. Examining the cut surface of the embryo, notice that the 



inner portion lying against the endosperm is solid 

 and represents the single cotyledon. 



5. The outer portion consists of two parts : an upper part 



of several pieces, one within the other (the plumule}, 

 and 



6. A lower solid part (the caulicle}. 



7. Make a detail sketch of the cut surface and label carefully. 



XII. Remove the embryo whole from a softened grain of 

 Corn and notice : 



1. Its general shape. 



2. The size of the cotyledon proportional to the rest of the 



embryo. 



3. The plumule and caulicle, hidden from sight. 



4. Sketch the embryo in different positions. 



XIII. Examine a seed of the Onion and notice : 



1. That there is a notch at one end. 



2. That there is a hole (the micropyle} on one side of the 



notch, and 



3. A scar (the hiluni) on the other. 



XIV. Holding the seed between the thumb and first fin- 

 ger, cut it into two pieces, in a longitudinal plane passing 



