MANUAI< OF NATURE! STUDY. 115 



Oats ? Why ? Then are all exogens dicotyledon- 

 ous and all endogens monocotyledonous plants ? 

 Make a list of each kind. Which do you think is 

 the more useful to man ? Why ? 



Ovary — See lessons on parts of the flower as 

 given in third grade. Collect a supply of flowers 

 for the pupils, being particular to select those con- 

 taining large ovaries or seed pods, so that the child- 

 ren may see with as little difl&culty as possible. 

 Flowers of indeterminate inflorescence will be best 

 for the reason that some of the lower ovaries are 

 ripening into quite large pods, while the upper por- 

 tions are just bursting into flowers. This will show 

 the progress made by the seed factories. Review 

 the parts of the flower as in third grade. This may 

 be done with any simple flower for two or three 

 exercises before dealing minutely with the organs 

 of reproduction. 



Now as to the ovary. What part of the flower 

 does the pistil occupy when single? What is their 

 position when there are two pistils ? When there 

 are several ? What part of the pistil does the ovary 

 occupy ? What are the other parts of the pistil ? 

 Purpose of each ? Open the ovary of a fresh flower. 

 What does it contain ? (Ovules.) Open the ovary 

 of a well matured seed pod. What does it contain ? 

 (Seeds.) How do seeds diflFer from ovules ? What 

 caused the ovules to grow into seeds ? The life, or 



