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Where two slopes adjoin, such ploughing steepens the valley between them into a gully, which, being always unsown, makes a track through the crops when they are up. Sometimes, though less frequently, the farmer ploughs away from a used track on quite flat land, and by doing this on both sides of the track, he makes the track a causeway or ridge-way, slightly raised above the adjoining fields.
In fine, the use which the engineer makes of grades and curves, when the physical nature of the country and the nature and amount of the traffic expected are known, may be taken as a pretty sure index of his real professional standing, and sometimes as an index of the moral man; as when, for example, he steepens his grades to suit the contractor's ideas of mechanics, in other words, to save work.
The result is that at a certain point in the advance, the place of which is determined by the depth, the size, and the speed of the undulation, the front swiftly steepens until it is vertical, and the top shoots forward to a point where it is no longer supported by underlying water, when it plunges down in what is called the surf or breaker.
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