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The reason is not that we become stronger with practice, but only that by doing it daily, we gradually acquire a Rule from it: Which Rule mostly lies in recognizing the balance of the things to be treated, by the grip, and that we handle the same in and under the Line, in which we bring them into motion, by the good posture of the Body, and keeping the counterweight, then treat it more neatly than we did at the beginning.

It would possibly go far beyond the scope of Human studies here to broadly show how the Wisdom of the Creator found relief and assistance in the movement of Men, also in quadrupeds, and Birds, and all that Lives; and how this also applies to the special movements of Animals. Kircherus stated quite frankly, the matter briefly, and exactly in these words; which we, because they confirm all our previous remarks somewhat remotely, will connect word for word to the thread of our Reasoning here. In the movement of Animals, he said, the foresight of Nature is mainly apparent, while it gives the quadrupeds such a form, that they cannot possibly advance, except through an angular extension of their Legs. I explain the matter with this Figure. Let A B C D be the four Feet of the Animal. A B, the two front ones. C D, the two hind ones. I say that the Animal cannot advance. The two Feet from one side B D, or A C, lifting simultaneously so that in this way the line of direction E F does not align with the Center of gravity of the said Animal.

The reciprocal movement of quadrupeds, mathematically explained.

Translation Notes

Mensch-kunde: Translated as 'Human studies' rather than 'anthropology.'