48 'The Principles of Part II. 



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SECT. II. 



Of manures, or the artificial methods of pro- 

 viding vegetable food. 



EXPERIENCE has fhown, that cer- 

 tain fubftances, committed to the 

 earth under certain regulations, make it 

 more fruitful. Thefe fubftances belong 

 either to the foffil, the vegetable, or the ani- 

 mal kingdom. The foffil include the dif- 

 ferent kinds of marl j calcarious ftones, fuch 

 as lime-ftone, chalk, &c. j and quick-lime. 

 The vegetable include all vegetables, and 

 their juices, either in an intire or a cor- 

 rupted ftate ; the afhes of burnt vegetables ; 

 the oils extracted from vegetables and loot. 

 The animal include calcarious (hells, intire 

 or corrupted ; horn-fhavings or tips j wool- 

 len rags 5 and all animal fubflances, fuch 

 as dung, urine, &c. 1 {hall treat of thefe 

 in their order. 



