... will be deficient for the action we require; and there is no man but knows a cable or chord of three inches diameter is not equal in strength to a chord of four inches diameter. So that if it should be asked why a handsome coach Horse, with as much beauty, length, and proportion as a foreign Horse, will not act with the same velocity and perseverance, nothing will be more easily answered, without appealing to blood; because we shall find the powers of acting in a foreign Horse much more prevalent, ... — A Dissertation on Horses • William Osmer
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