Hi. Agriculture and Vegetation* 1 6 1 



By the dilatation of the water, as it freezes 

 In the earth, the adhering particles mufl 

 be feparated. 3dly, The particles of water 

 (hooting out in the manner of falts, muft 

 cut and divide the foil. 



Cor. That the ground may receive, in 

 the ftrongeft manner, the good effects of 

 froft, it would appear reafonable, that it 

 mould get one ploughing before the froft 

 comes on. One furrow at this time will 

 attenuate it more than two afterwards. Re- 

 gard muft always be had to the climate; 

 for where much rain falls in the winter, 

 this practice would prove pernicious, by 

 expofing the foil to be warned away. 



SECT. III. 



Change of fpecles. 



THERE are fome plants defigned by the 

 author of nature to fix the foil j 

 there are others defigned to open it. One 



M great 



