"The Story of Civilization", Vol. IX, "The Age of Voltaire", "Jethro Tull was a lawyer, his health failing, he went back to his father's farm; his sharpened mind was fascinated by the miracle and profits of growth, but was repelled by the wasteful methods of tillage that he saw--farmers broadcasting nine or ten pounds of sead to an acre so carelessly "that two thirds of the ground was unplanted, and on the rest 'twas so thick that it did not prosper." Taveling in France and Italy, he studied agricultural methods, returning, he bought a farm, and shocked his neighbors with inventions that doubled production. He began (c. 1730) by making a four-coultered plow that would uproot and bury weeds instead of merely shoving them aside. But his most decisive invention (c. 1733) was a horse drawn drill mechanism that fed seed through notched funnels at a specific spacing and depth in two paralel rows, and then covered the seeds by a harrow attached to the drill. The machine saved seed and labor and allowed the cult
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