2 2 8 SHEPHERD' S P URSE. 



At the free end of as old a seed as possible, tear the seed- 

 coats slightly, and by careful pressure force out 



e. The embryo. Make out the relations of 



i. The seed-leaves, the cotyledons. 

 ii. The initial stem, the caulicle. 



f. Draw the embryo. 



In a transverse section across the long axis of the seed, 

 note 



g. The seed-coats. 



h. The cut faces of the two cotyledons, rather flat 



and in contact with each other. 

 i. A section of the caulicle, at the narrower end of 



the section, and lying against the back of one 



cotyledon (incumbent). 

 j. Diagram the section. 



MINUTE ANATOMY. 

 A. THE ROOT. 



i. The rootlets. Remove some of the smallest rootlets, 

 examine with a high power, and note 



a. In complete rootlets, the root-cap. 



b. Behind the root-cap the central cluster of mer- 

 istematic cells, from which diverging rows of cells 

 pass off, gradually merging into 



c. The permanent tissues of the rootlet. 



d. The root-hairs ; the portion of the root on which 

 found. 



e. Make a diagram of the tissues of the root-tip, and 

 also draw some root-hairs accurately. 



Make a transverse section of a very small rootlet, 4 examine 



4 Secondary changes take place so rapidly in the roots of Capsella, that 

 some difficulty may be experienced in finding one with typical primary 

 root structure ; very young rootlets should therefore be selected for exam- 

 ination. 



