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ELEMENTARY AGRICULTURE 
14. What familiar crops are injured by plant lice? 
15. How does a butterfly differ from a moth? 
16. How may weevils be destroyed? 
17. How are grasshoppers destroyed? 
PRACTICAL WORK 
1. Collect eggs, cocoons, larvae and pupae of insects. If these 
are placed under glass jars and studied during the year, the 
various stages may be studied as the changes take place. Cater¬ 
pillars may be fed leaves until the cocoon is formed. It is very 
interesting to collect potato bug eggs and hatch the young red 
larvae under a jar. 
2. If the class has made a collection of weed seeds for the 
school room display (Fig. 10), some of these seeds should be 
germinated to study the method of breaking the seed coat. Note 
the young seedlings. Do they grow more readily than wheat or 
corn? Try to germinate cockleburs without breaking the seed 
coat. Then open the bur and scratch the seed. Note how 
quickly these germinate. This may explain why cockleburs 
remain so long in the soil. 
3. Collect a number of fleshy fungi. Examine those growing 
upon the bark of dead trees and upon decayed logs. Find the 
white thread-like structure under them. Gather several dried and 
decayed peaches or plums that have remained upon the trees 
over the wipter. Put these under a glass jar with moist cotton 
or paper. After a few days, note the different kinds of growths. 
This fungus growth was probably the cause of the brown rot 
of the fruit of the previous season. Keep corn moist, under a 
jar, and note the molds growing upon the grains. 
WORDS TO BE LEARNED 
Cankers. Any disease of trees causing slow decay of the bark 
and wood. 
Devastated. To lay waste; desolate. 
Herbaceous. Pertaining to or having the characteristics of 
herbs. 
Medicinal. That which is useful for medicine. 
