The name of _quadruped_ supposes an animal with _four feet_. If it be deficient in two, like the manati; if it have hands and arms like the ape; or if it have wings like the bat; it is not a quadruped: therefore this general denomination is erroneous when applied to either of those animals. In order to speak with precision, there should be truth in the ideas which the words represent; for instance, let us find a word to convey a perfect idea of an animal with two hands; if we had a term to denote a two-handed animal, as well as one with two feet, we might then say, that man alone is biped and bimanous, because he alone has two hands and two feet; that the manati is only _bimanous_; that the bat is only a _biped_; and the ape a _quadrimanous_, or four-handed animal. Let us now apply these _new_ denominations to every particular being with which they agree, and we shall discover, that from the two hundred species of animals to which we have given the common name of _quadrupeds_, there are thirty-five sorts of apes, baboons, monkeys, sapajous, sagoins, and makis, must be retrenched, as they are _quadrimanous_, or four-handed; and that to those thirty-five species we must add the lori, the murine, Virginian and Mexican opossums, and the jerboas, which are also _quadrimanous_, like those above-mentioned, and that, consequently, the list of four-handed animals being at least composed of forty species, the real number of quadrupeds will be reduced one fifth part. If afterwards we take out twelve or fifteen species of bipeds, namely, the bats, whose fore-feet may rather be called wings than feet, and also three or four jerboas, because they can only walk on their hind feet, those before being too short; if we remove also the manati, which has no hind feet, and the different species of the walrus, and the seal, to which animals they are entirely useless, the number of quadrupeds will be found diminished a third more; and if we still subtract those animals which make use of their fore-feet like hands, as the bears, marmots, coatis, squirrels, rats, and many others, the denomination of quadrupeds will appear to be misapplied to more than one half of these animals. In fact real quadrupeds consist only of whole and cloven-footed animals. When we descend to the digitated class, we find four-handed, or ambiguous quadrupeds, who use their fore-feet in the manner of hands, and which ought to be distinguished or separated from the rest. There are three species of whole hoofed animals, the horse, the zebra, and the ass; and, by adding the elephant, the rhinoceros, the hippopotamus, and the camel, whose feet, though terminated by nails, are solid, and only serve for the purpose of walking, we shall have seven species to which the name of quadruped perfectly applies.