his is encouraging to the men of science; but, on the other hand, they must admit that by far the greater portion of the sum of human knowledge has been derived from the experience and observation of men utterly unacquainted with science, in the ordinary signification of that term. This portion of our knowledge is also, in its practical application, the most valuable. In the most important branch of industry--agriculture--the labors of the purely scientific man have as yet borne but scant fruit; whilst the unaided efforts of the husbandman have reclaimed from sterility extensive tracts, and caused them to "blossom as the rose." That practical men should have done so much, and scientific men so little, for agriculture, may easily be explained. Countless millions of men, during many thousands of years, have incessantly been occupied in improving the processes of mechanical agriculture, which, as an art, has consequently been brought to a high degree of perfection: but scientific agriculture is a creati
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