Old Hesiod, in the second book of his “Works and Days,” after giving particular directions for the selection of the wood, as to its natural qualities and form, and also its suitability to an artificial curve, gravely shakes his venerable head, and says-- “To make a plough, great is the expense and care.” Virgil, following his great progenitor, enters with still more minute precision into the details of the selection of the wood and its manufacture into a plough, adding, that he can “recite to you many precepts of the ancients--unless you decline them.” Well, then, to be frank with antiquity, and all its great poets and philosophers, the present age fairly announces by its practices, that it _does_ decline, not only the precepts but the example of the ancients, especially in agricultural matters. The last and not the least important innovation on agricultural labour has yet to be consummated; and it would seem from two large plates, with explanatory remarks, which have been recently published by Lord Willoughby de Eresby, that a monster innovation is not very distant;--no less than “Ploughing by Steam.” All great inventions are the result of gradual improvement on a first idea; and an examination of these plates naturally induces us to take a cursory view of what has previously been attempted, and done, in this way. Not wishing to go back to the “dawning idea” of a steam-plough, (for the problem was started some fifty years ago), we will begin with taking a look at Mr. Etzler’s “Iron Slave.” This was invented by a German, and constructed by an Oxfordshire engineer. A public trial of the Iron Slave was made in October 1845. A few signal shots were fired at day-break, the church-bells were set to ring a merry peal, and all the inhabitants of Bicester and Blackthorn came pouring out into the fields to witness the steam-performance of the newly discovered agricultural serf. Booths were erected, and the spectators made a long morning’s holiday while the Slave did his ploughing; and hoped that his success would lead, as it ought, to many other morning holidays. The most important result of this first trial was the establishment of a new mechanical principle, _viz_., “the transmission of power from a fixed point to a moving point, going in arbitrary directions at the will of one man at the steering wheel.” This, it seems, had been thought impossible by many scientific engineers. The engine was intended to move and do its work at the rate of three miles an hour; but whether the Iron Slave had not had his proper breakfast of coals, nor time enough to digest them into steam, or some part of his inside was a little out of order, was not accurately discovered; but certain it is that he could not plough fast enough. In other respects everybody was satisfied that steam-ploughing was a practicable thing.