C 33 3 



port of his art, it would appear that his principal 

 dependance is upon manure, for till his foil is 

 rendered fertile, his art and his labour would be 

 fruitlcfs and vain. Surely it is no argument, that 

 proper manure will not reftore fertility to an ex- 

 hauftcd and debilitated foil, becaufc it will not 

 produce iimilar effects in thofe which have been 

 already drenched and furfeited with too much. 

 A gardener is generally profufe in the ufe of 

 dung, as long as he finds it will force his crops; 

 but the time will come, when by this means the 

 foil will become fo rich, light, and porous, that it 

 would bear nothing but a mufhroom or a fungus, 

 a pompion or a gourd. 



The products of nature and of art have each 

 their ne plus nil 'ra, and the efforts of the latter are 

 univerfally circumfcribed by the former; and per- 

 haps there is no article in either, which under 

 different circumflances, as quantity may be pro- 

 portioned, may not be a medicine or a poifon. 

 And this, it is prefumed, will ever hold true both 

 in the animal and vegetable kingdoms. 



Every one knows the upper flratum of mould, 

 which is found on the furface of all fertile foils, 

 is that in which fertility chiefly refides, and it is 

 equally certain, that the more conftantly land is 



under 



