well as the apes and baboons, have particular and general characters, which entirely separate them from the sapajous and sagoins. The first of these characters consists in the rump being bare, on which are natural callosities peculiar to those parts. The second is the having pouches on each side of the jaw, in which the animal can store its food. The third is in the make of the nostrils, which are narrow, and the apertures placed in the under parts, like those of man. The sapajous and sagoins have not one of these characters. The partition between their nostrils is very thick, and the apertures are placed on the sides of the nose, and not below it. They have hair on their posteriors, and no callosities; they have no pouches on each side of their jaws; and hence these animals differ not only in species but even in genus, since they have not any of the general characters common to the whole tribe of monkeys; and this difference in genus supposes still greater in the species, and demonstrates them to be quite distinct from each other. The names of ape and monkey, therefore, have been very improperly applied to the sapajous and the sagoins. We must preserve their original names, and instead of ranking them with the apes, we should begin by comparing them together. These two families differ from each other by a very remarkable character. All the sapajous make use of their tails like a finger to hang by, and to procure what they cannot reach with their hands. The sagoins, on the contrary, cannot make use of their tail in that manner. Their face, ears, and hair, are also different; we may, therefore, very properly divide them into two distinct races.