The Old World section, with its close and downward-looking nostrils, at first sight appears very united, but after a little noticing there seem to be many different groups in it. Firstly, the commonest kinds make up for the absence of a clinging tail, such as their American cousins have, by having something which the Transatlantics would be glad of, namely, cheek pouches--comfortable receptacles for nuts and such delicacies within the mouth, where food can be kept as in a cupboard, until it is required, or can be enjoyed in safety. These are the valuable properties of many of the smaller African tribes. Then they also have, in the absence of soft clothes and comfortable chairs to sit upon, fur or hair and a natural hardness or “callosity,” or seat, which does not wear out, and which is often strangely coloured. Another group has no cheek pouches, but it possesses the callosities, and these less favoured creatures come mainly from Asia and the great islands, and only a few from Africa. Finally, the most important group of the section consists of the large Apes, with neither tails, callosities, nor cheek pouches, but having very man-like features; for instance, the great Troglodytes, Chimpanzees, and Orangs, the first two from Africa, and the last from the great Asiatic islands and the mainland. [Illustration: ONE OF THE CYNOMORPHA--THE BABOON.] These tribes could be, with more study (especially if the merry company were broken up by the anatomist taking them one by one and dissecting them), divided over and over again, and separated into kinds or species, which would not, however, always tally with the corresponding arrangement of the naturalist, who would go by the skin and the outside of the animals. One thing would be quite clear to every one, and that is that some of the creatures greatly resemble man at first sight, and that although this likeness diminishes with study, still there is a group, which deserves the title of the “man-shaped.” Others form a group which go usually on all fours, looking like dogs, more or less, and they are the “dog-shaped,” but they of course retain the more or less man-like peculiarities which characterise the whole of the Monkeys. Hence, after all these divisions and differences and resemblances have been mastered, it would be found that the noisy assemblage could be arranged as follows:-- 1.--CATARHINES.--Old World Monkeys, man-shaped and dog-shaped. 2.--PLATYRHINES.--New World Monkeys. The first section, the _Catarhines_, may be divided into the man-shaped, or in the Greek the _Anthropomorpha_, and the dog-shaped, or the _Cynomorpha_. Or they may be arranged as those, with: 1, cheek pouches and callosities, for instance, the Baboons; 2, those with callosities only, the Monkeys; and 3, those without either, and without a tail, the Apes.