MANUAL 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 difficulty 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 differ from ovules ? What 
caused the ovules to grow into seeds ? The life, or 
