SECT. VIII. GRAFTS. 431 



from the graft. Some gardeners will indeed tell 

 you that a Rose grafted on a black Currrant will 

 produce black Roses ; but this is a vulgar error. 

 The graft will also bear fruit much sooner than the 

 tree that is raised from seed ; and, if effected on a 

 proper stock, will be much more hardy and vigo- 

 rous than if left on the parent plant. And hence 

 the great utility of grafting in the practice of gar- 

 dening. 



CHAPTER X. 



CAUSES LIMITING THE PROPAGATION OF THE SPECIES. 



FROM the various sources of vegetable reproduc- 

 tion, but particularly from the fertility and dis- 

 persion of the seed, the earth would soon be over- 

 run with plants of the most prolific species, and 

 converted again into a desert, if it were not that 

 nature has set bounds to their propagation by sub- 

 jecting them to the control of man, and to the 

 depredations of the great mass of animals ; as well 

 as in confining the germination of their seeds to 

 certain and peculiar habitats. The operation of the 

 two former causes it is not necessary for me to il- 

 lustrate at present. My remarks shall therefore be 

 directed merely to the illustration of the latter; 

 namely, that of the circumscription of the habi- 

 tats and propagation of plants as dependant on soil, 

 climate, and altitude. 



