In connection with this change of system, Washington became an early convert to the rotation of crops, and drew up elaborate tables sometimes covering periods of five years, so that the quantity of each crop should not vary, yet by which his fields should have constant change. This system naturally very much diversified the product of his estate, and flax, hay, clover, buckwheat, turnips, and potatoes became large crops. The scale on which this was done is shown by the facts that in one year he sowed twenty-seven bushels of flaxseed and planted over three hundred bushels of potatoes. Early and late Washington preached to his overseers the value of fertilization; in one case, when looking for a new overseer, he said the man must be, “above all, Midas like, one who can convert everything he touches into manure, as the first transmutation towards gold;—in a word one who can bring worn out and gullied Lands into good tilth in the shortest time.” Equally emphatic was his urging of constant ploughing and grubbing, and he even invented a deep soil plough, which he used till he found a better one in the English Rotheran plough, which he promptly imported, as he did all other improved farming tools and machinery of which he could learn. To save his woodlands, and for appearance’s sake, he insisted on live fences, though he had to acknowledge that “no hedge, alone, will, I am persuaded, do for an outer inclosure, where _two_ or four footed hogs find it convenient to open passage.” In all things he was an experimentalist, carefully trying different kinds of tobacco and wheat, various kinds of plants for hedges, and various kinds of manure for fertilizers; he had tests made to see whether he could sell his wheat to best advantage in the grain or when made into flour, and he bred from selected horses, cattle, and sheep. “In short I shall begrudge no reasonable expence that will contribute to the improvement and neatness of my Farms;—for nothing pleases me better than to see them in good order, and everything trim, handsome, and thriving about them.” The magnitude of the charge of such an estate can be better understood when the condition of a Virginia plantation is realized. Before the Revolution practically everything the plantation could not produce was ordered yearly from Great Britain, and after the annual delivery of the invoices the estate could look for little outside help. Nor did this change rapidly after the Revolution, and during the period of Washington’s management almost everything was bought in yearly supplies. This system compelled each plantation to be a little world unto itself; indeed, the three hundred souls on the Mount Vernon estate went far to make it a distinct and self-supporting community, and one of Washington’s standing orders to his overseers was to “buy nothing you can make within yourselves.” Thus the planting and gathering of the crops were but a small part of the work to be done.