712,6il tons of capital manure, although even this 

 quantity would, at 4 tons per acre, manure 158,152 

 acres of land each year; and supposing it manured 

 once in four years, would keep 712,611 acres, or 111»3 

 square miles, in a high state of cultivation. But if 

 this valuable material is used in a way which I shall 

 hereafter explain, it may be made to manure eight 

 times as many acres. We will, however, only take it 

 at half, or four times, which is much below the real 

 quantity, and it will be found sufficient for 2,850,444 

 acres, or 4552 square miles of land, and this, be it 

 remembered, from London alone. What, then, must be 

 the loss in the three kingdoms, at the same time that 

 we are expending Fourteen Millions sterling per annum 

 for Foreign produce'^ 



The gross annual Agricultural Produce of the United 

 Kingdom might be estimated at about £200,000,000, 

 which may, by better modes of fertilizing the soil, be 

 readily doubled. 



The gross annual expense of cultivation, exclusive of 

 rent, is about £100,000,000, which may be reduced one- 

 half ^heii the soil is rendered more fertile. 



And again. Col. Le Couteur, in his " Treatise on the 

 Varieties, Properties, and Classification of Wheat," is 

 of opinion, that by proper attention to the selection of 

 farinaceous seeds, it is possible to produce an increase 

 in the annual value of the wheat crop of the British 

 Isles to the extent of £18,900,000 ; while Mr. Kim- 

 berley estimates, that his new manure might effect an 

 economy in that department of husbandry to the yearly 



