NATURE-STUDY LESSONS. 125 



14. Describe the parts found in this seed which are 

 not in the bean or pea. 



15. {a) In what respects are all the seeds examined 



similar? 

 (d) In what respects are they different? 



16. How many cotyledons are found in each? 

 Seeds containing two cotyledons are dicotyledonous seeds. 



17. What was found in the castor-bean that was not 



found in the common bean or the pea ? 



Seeds like the castor-bean containing albumen outside the embryo are 

 said to be albuminous. Those like the bean and the pea containing no 

 albumen outside the embryo are said to be exalbuminous. 



18. {a) Examine other seeds, such as those of the 



squash, sunflower, almond, maple, butter- 

 cup, etc., and compare them with those 

 already examined. 

 {fi) Classify them as albuminous or exalbuminous. 



D. Monocotyledonous Seeds. 



19. {a) Treat Indian-corn in a similar manner to the 



seeds examined. 

 (b) Describe the external features of the grain. 



20. (a) Make a longitudinal section perpendicular to 



the flat sides and through the middle of the 

 grain which has been soaked for a day or 

 more. 



(^) Observe the strong external covering com- 

 posed of the united coats of the seed and 

 fruit. 



{c) Make a drawing of the cross-section. 



21. {a) Strip off the entire covering from the paler 



face of the soaked grain and remove the 

 whitish body lying on the face of the grain. 



