40 A Change and Succession of Crops recommended. 



In some degree connected with the foregomg sub- 

 ject, I think it useful to recall the attention of the Soci- 

 ety, to the communication, I made, at their request, on 

 peach trees. The contagious disease, I therein men- 

 tioned, as having given me some monitory indications, 

 has verified these warnings. I have lost a great num- 

 ber, in the manner described, without the agency of 

 the worm. I shall take my old course of eradicating the 

 disease, by removing its subjects. I shall use none out 

 of my own nursery, but procure young trees from a 

 distance, beyond the scene of infection. I observe, 

 throughout my neighbourhood, the same disease, pro- 

 ducing the like destruction. 



R. P. 



(diough there are wandering exceptions) suitable to the soil. 

 Aquatic plants will not be found in arid situations ; nor vice 

 versa. The next step is to recover timber. This occurs in 

 new, as well as old lands, when timber had been thereon ori- 

 ginally. In glades^ prairies^ or places not naturally woody, 

 it is otherwise. The timber, though often changed in species. 

 Is adapted to the qualities of the soil. So is the herbage of 

 the lands, to which nature has denied timber. This should 

 be attended to, in artificial plantations. 



See St. Pierre's studies of nature ; f Beauties of the Stu- 

 dies. 108. J for an handsome description of the operations of 

 ■nature, Avhen resuming her violated domain. 



