Se6t.II. Agriculture and Vegetation. 157 



moifture of the materials is of ufe, as it is 

 neceflary to the attraction of all falts. It 

 has been obferved, that the fbuthern fide 

 of thefe walls has lefs nitre. To remedy 

 thefe defects, I would propofe, that the 

 wall fhould be (hadowed on the fouth by 

 a hedge, which will keep off the rays of 

 the fun, hinder it from turning too dry, and 

 allow the air a free paflage. The putrefac- 

 tion, which goes on in fuch a fituation, 

 will be of great advantage to the procefs. 



PART 



