88 GENERAL BIOLOGY. 



4. Split apart the cotyledons and observe the 

 radicle and the plumule lying between them. 

 Sketch. 



What is the position of the radicle with refer- 

 ence to the micropyle ? 



II. Pea. 



Examine in the same way as the bean. 



III. Castor-oil Bean. 



Carefully take off the hard outer seed-coat and 

 then strip off the thin inner coat. Separate 

 the bean longitudinally into two parts. Exam- 

 ine with a hand-lens. 



Find the plumule, the radicle, and the cotyle- 

 dons. Is there anything else present ? What 

 differences are observable between the castor- 

 oil bean and the common bean ? 



IV. Buckwheat. 



With a small scalpel take off the outer seed- 

 coat. Observe the thin, light-colored coat 

 beneath. Remove this carefully, and find the 

 parts enclosed by it. How do they compare 

 with the parts within the seed-coats of the 

 bean and pea ? And with Ifhose of the castor- 

 oil bean ? 



V. Indian Corn. 



1. How do the two sides of the grain differ 



in appearance ? Sketch. 



2. With a scalpel peel off the seed-coats. 

 Observe the yellow endosperm. Kemove this, 



