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 16 MANUAL OF NATTJRS STUBY. 



leaves and notice the scaly covering in each case. 

 Compare with naked buds in green house. Notice 

 the sticky substance that holds these buds to- 

 gether. Compare with naked buds. Bring up 

 this question again in spring time when the buds 

 begin to open. 



Compare the bark of plants that endure the 

 winter, with that of green house plants. Why the 

 difference? Notice difference between bark of this 

 year's growth and that of last year's growth. How 

 does it differ at frosting time from the growing 

 time? 



Notice that some plants, like the violet, spring 

 beauty and potato, go into winter quarters under 

 the ground just as some animals do. 



Observe that trees burst their bark when they 

 get too large for it, thus making the outside very 

 rough, as seen in the walnut or bur-oak. How 

 ^.bout the locust or grasshopper, crayfish and cicada 

 when they grow too large for their skins? The 

 snake, frog, boy? 



6. Effects of Frost: — On leaves, buds, stems 

 and flowers. The suggestions under (5) are ap- 

 plicable here. 



Bring out the thought that some plants die 

 down to the ground every year when frost comes, 

 while others only drop their le?ives, 



