Biped

Definition and stakes

Portrait of John Collins Warren John Collins Warren,  Remarks on some fossil impressions in the sandstone rocks of Connecticut River

“ In a quadruped, the horse for example, the hind feet are set down near the fore feet, and sometimes even strike them. Hence it must be inferred that the track in question was that of a biped, or of a quadruped which did not use its fore feet in progression, like a kangaroo. We naturally ask, What kind of biped could this have been? Evidently not a man, the size of the foot being too large to admit such a supposition; nor could it have been a bird, the number of toes and their direction not admitting this hypothesis. ”
Source: Gutenberg

Henry L. de Bussigny,  Equitation (1922)

“ The reader will note that it is always from the fore leg involved that the right or left diagonal biped takes its name. This, in my opinion, is a mistake. The hind leg is the one which gives the impulse and is the cause of every movement. The action of the fore leg is merely the consequence. It would, therefore, have been more logical to have named the bipeds from the hind legs; and more in accord with the equestrian maxim, "Forward, forward, always forward." This means impulsion, and impulsion is possible only by the effects of the rider's legs acting on the hind limbs of the animal. ”
Source: Wikisource

Portrait of James Bell Pettigrew James Bell Pettigrew,  Animal Locomotion; or, walking…

“ When a fish swims, the anterior and posterior portions of its body (supposing it to be a short-bodied fish) form curves, the convexities of which are directed on opposite sides of a given line, as is the case in the extremities of the biped when walking. The mass of the fish, like the mass of the biped, when once set in motion, contributes to progression by augmenting the rate of speed. The velocity acquired by certain fishes is very great. A shark can gambol around the bows of a ship in full sail ”
Source: Gutenberg

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