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Manures purchased annually in England.

--Prof. Anderson gives the following estimate of the amount expended annually by the farmers of Great Britain for artificial manures:

Guano$12,500,000
Nitrate of Soda1,125,000
Bones1,200,000
Super phosphates2,100,000
Coprolites1,875,000
Sulphate of Ammonia750,000
Other Articles500,000
Total$20,950,000

This expenditure, coupled with improved methods of tillage, accounts for the fact that the average product of wheat in England has been raised from 8 or 9 bushels to nearly 30 bushels per acre.

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