136 NATUBE-STUDY LESSONS. 



i6. If young plants are prevented from growing, why 

 will not the lawn become cleared of plantain ? 

 Plants which live on year after year are said to he perennial. 



17. Name other perennial plants. 



18. What must be done with the old plants so as to 

 exterminate this weed ? 



19. {a) In exterminating perennial plants with roots 



like those of the thistle and dandelion, and 

 those with fibrous roots, what difference must 

 be made in their treatment ? 



(b) What different conditions in the life of these 

 plants necessitate a difference in the mode 

 of their extermination ? 

 E. Its Uses. 



20. Discover, if possible, the uses of plantain, 



XXXVI. -BREAD. 

 A. The Loaf. 



1. {a) Observe bread at home; also, if convenient, at 



a store where it is sold, or at a bakery. 



{b) Describe the different forms in which bread is 

 made up. 



2. Cut a slice off a loaf; name and describe the differ- 

 ent parts seen. 



3. («) Examine the crust to discover the differences in 



the upper and under parts. 



{b) Account for any differences you observe. 



4. {a) Describe the interior of the loaf. 



{b) In what respects does it differ fronj the crust? 



