[ '9^ ] 



ingredient was defedive, and the argillaceous fuperabundant, 

 but the calcareous exad ; its compofition flood thus : 



Sand and gravel - - 47 



Argill - - 22 



Mild calx - - 3^ 



Here the fandy part wants 10 per cwt. the argill is fuper- 

 abundant, but we cannot increafe the proportion of fand without 

 diminifhing that of calx. Hence we muft either ufe a fmaller 

 proportion of the fandy ingredient than its defed requires, or 

 apply a fubftance that would fupply fome proportion of the 

 calcareous ingredient alfo ; fuch are limeftone gravel, iiliceous 

 marie, effete lime, mixed with fand or pounded limeftone. 

 Suppofe the proportion of the fubftance to be employed were 

 fix per cwt. that is fix pound for every hundred pounds of the 

 foil, then the quantity requifite for an acre may be calculated 

 thus : a fquare foot of this foil, cut down to the depth of 14 

 inches, and paring off the two uppermoft as confifting chiefly of 

 roots, &c. weighs, as we have feen, i2olb.; and if loolb. requires 

 fix of the manure, 1 2olb. will require 7,2 ; therefore every fquare 

 foot of the foil will require 7,2 of the manure : now an Englifli 

 acre contains 43560 fquare feet, and confequently 43560 mul- 

 tiplied into 7,2 of the manure = 3136321b. or 208 cartloads, 

 reckoning 1 5001b. to the cart load. 



Cbalkey 



