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laft are generally called by farmers, light or hungry foils; par- 

 ticularly when they have but little depth. 



Ftrruginous Loam, or Till. This is generally of a dark brown, 

 or redclifli colour, and much harder than any of the preceding; 

 it confifts of clay and calces of iron more or lefs intimately 

 mixed ; it may be diftinguifhed not only by its colour, but alfo 

 by its fuperior weight ; it fometimes effervefces with acids, 

 and fometimes not ; when it does, much of the irony part may 

 be feparated by pouring it, when well dried, into fpirit of 

 fait, from which the iron may afterwards be feparated by alkalis 

 or chalk. 



Akin. To this are certain vitriolic foils ., which, when 



fteeped in water, impart to it the power of reddening fyrup of 

 violets. Thefe are generally of a blue colour, but redden when 

 heated. 



Boggy Soil, or Boggs, confift chiefly of ligneous roots of de- 

 cayed vegetables mixed with earth, moflly argillaceous, and 

 fand, and a coaly fubftance derived from decayed vegetables. 

 Of boggs there are two forts ; the black, which contain a 

 a larger proportion of clay and of roots more perfedly decayed, 

 with mineral oil ; in the red the roots feem lefs perfedly decayed, 

 and to form the principal part. 



Heathy Soil is that which is naturally produflive of heath. 



SECTION 



