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SECTION II. 



Of Manures, 



Manure denotes any fubftance or operation by which a foil is 

 improved. To improve a foil is to render it capable of producing 

 corn, legumens, and the moft ufeful grafl'es. 



The fubftances principally ufed as manures, are chalk, lime, 

 clay, fand, marie, gypfum, afhes, ftable dung, mucks, farm-yard 

 dung, pounded bones, fea-wced, fweepings of ditches, old ditches. 

 Other manures or top-dreffings, as they arc employed chiefly to 

 promote the growth of vegetables, and not merely with a view 

 of improving the foil, I omit. 



The operations ufed to improve foils, are fallows, draining, 

 paring and burning. . ^ - . ■ 



I 



Of chalk, clays and fand we have already treated. 



Lime -is a fubftance whofe external charaders and mode of 

 produ.<3i,9n are well known. , It differs from chalk and powdered 

 limeftone chiefly by the abfence of fixed air, which is expelled 

 from thefe during their calcination. This air it greedily re- 



abforbs from the atmofphere, and all other bodies with which 



• j; '..vsj. . . ■■: - -^ - . '. '^ '''."■' ■ 



it^cpmes in contad, and whi^^ can furnifli it j^^ihut it, cannot 



. rVoL. V. S unite 



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