NO TWO PARTS ARE ALIKE 



U* 





K 



mm 



6. A Tree. The weeping birch. 



- r 



Plants that produce one 

 main trunk and a more or less 

 elevated head are trees. (Fig. 6.) 



16. Plants are Modified by the 

 Conditions in Which They Grow. — 

 In most plants, the size, form 

 and general appearance vary or 

 change with the conditions in 

 which the plant grows. That is, 

 there is no uniform or necessary 

 form into which all plants shall 

 grow. No two plants are exactly 

 alike. Observe plants of the same 

 kind and age, and see how they 

 differ or vary. The farmer and 

 gardener can cause plants to be 



large or small of their kind, by changing the conditions or 



circumstances under which they grow. 



17. No two parts of the same plant are exactly alike. 

 No two parts grow in the same conditions, for one is nearer 

 the main stem, one nearer the light, and another has more 

 room. Try to find two leaves or two branches on the same 

 plant that are exactly alike. (Fig. 7.) 



18. Every plant makes an effort to propagate or to per- 

 petuate its kind; and 

 so far as we can see, 

 this is the end for 

 which the plant itself 

 fives. The seed or 

 spore is the final pro- 

 duct of the plant. 



19. Every plant, 

 — and every part of 

 a plant — undergoes 

 vicissitudes. Every 



