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shown to influence the extent of its effect on a crop, 

 and fresh long dung, applied late in the season, does 

 little to benefit a crop of early potatoes. In the same 

 way a concentrated manure, in which the constituents 

 are but slowly available, is of less value to a crop of 

 earlier than to a crop of late potatoes. The farmer 

 should know from previous observation in what con- 

 dition his land is, and must make his calculations 

 accordingly. Twenty tons of dung cost, at least, 5, 

 and frequently 7 per acre. Dr. Munro's mixture pre- 

 viously mentioned costs for the 12 cwt. 3 10s. But 

 larger dressings of dung are frequently given, thus 

 increasing the cost. Under most conditions we favour 

 the use of a mixture of dung and artificials, and, 

 taking all points into consideration, think a dressing 

 of 15 tons of dung and 6 cwt. of the mixture of 

 artificials the most economical method to adopt. This 

 gives a good full dressing, at a cost of from 5 10s. to 

 6 10s. per acre, in which a reasonable proportion of 

 mechanical and manurial influences are brought to the 

 aid of the crop. 



M. Girard has recommended a dressing suitable for 

 a naturally fertile soil, which, converted into cwts., is 

 5*6 cwts. of superphosphate, 9*6 cwts. of kainit, and 

 1"6 cwt. of nitrate of soda, together with from 11 to 

 ] 3 tons of farmyard manure. Taking the smaller 

 quantity of dung at 5s. per ton, the cost of this dressing 

 would be 6 per acre, while the heavier dressing of 

 dung at 7s. per ton would make it 7 16s. per acre. 



