Paragraph

 1 12|        arms backwards, their legs forwards; quadrupeds their forelegs
 2 12|         quadrupeds their forelegs forwards, their back legs backwards,
 3 12|          leg has its articulation forwards, impossible if it be backwards.
 4 12|          backwards. For, if it be forwards, the stretching out of the
 5 12|           while the body is going forwards, but, if the other way,
 6 12|        that is, backwards and one forwards; for in the bending together
 7 12|          shin would move the foot forwards away from the flexion; whereas,
 8 12|         whereas, with the flexion forwards, the progression described
 9 12| necessarily bend their front legs forwards. For these lead off first
10 12|     flexion of the hind legs were forwards the lifting of these feet
11 13|          in the opposite way both forwards, as in B, or in converse
12 13|          in C where the fore bend forwards and the hind bend backwards,
13 13|         but the wrist of the hand forwards, and again the shoulder
14 13|            and again the shoulder forwards. In like fashion, too, in
15 13|           hip backwards, the knee forwards, the ankle in the opposite
16 13|   opposites, the shoulder bending forwards, the hip backwards; wherefore
17 13|         and the wrist of the hand forwards.~
18 14|  progression would be a stumbling forwards with the hind parts as it
19 14|        only animal that moves not forwards, but obliquely. Yet since
20 14|          but obliquely. Yet since forwards is a distinction relative
21 14|  exception but in this sense move forwards.~
22 15|        neither stand still nor go forwards.~Again, the bird though
23 15|          in this way would follow forwards as they are carried along
24 16|       have had their flexion both forwards and backwards; on account
25 16|            on account of leading, forwards; and on account of following,
26 16|    polypods; they do not progress forwards except in the sense explained