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1 1 |        and why all have an even number of feet, if they have feet
2 1 | progression depends are even in number.~Next, why are man and bird
3 4 | naturally determined are six in number, superior and inferior,
4 8 |         has necessarily an even number of such limbs. For those
5 8 |         make progress on an odd number of limbs, as may be seen
6 8 |       limbs is corrected by the number of limbs which remain on
7 8 |      better if they had an even number, in fact if none were missing
8 9 |        all animals have an even number of feet, and the reasons
9 16|     this kind of flexion is the number of their legs; arranged