Bonaventure says:
“I ANSWER THAT: It must be said, that in animals the movement of crawling [rependi] differs from the movement of walking [gradiendi]. For the movement of crawling is attained according to a 'being dragged' [tractionem]; for the animal, which craws [repit], protending some anterior part and apprehending something with that, drags the whole of its body after itself, just as is clear among worms; but the movement of walking is through a 'being impelled' [impulsionem].”
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