Sociability, with its consequences, the moral feelings, is a peculiarity which distinguishes man from some, but not from all, animals. There are, however, some peculiarities which belong to man only, and which separate him from the entire animal world. These, in the first instance, are language, then reason. Man is also the only animal that makes use of self-made tools. For all these things, animals have but the slightest propensity, but among men, these have developed essentially new characteristics. Many animals have some kind of voice, and by means of sounds they can come to some understanding, but only man has such sounds as serve as a medium for naming things and actions. Animals also have brains with which they think, but the human mind shows, as we shall see later, an entirely new departure, which we designate as reasonable or abstract thinking. Animals, too, make use of inanimate things which they use for certain purposes; for instance, the building of nests. Monkeys sometimes use sticks or stones, but only man uses tools which he himself deliberately makes for particular purposes. These primitive tendencies among animals show us that the peculiarities possessed by man came to him, not by means of some wonderful creation, but by continuous development. Animals living isolated can not arrive at such a stage of development. It is only as a social being that man can reach this stage. Outside the pale of society, language is just as useless as an eye in darkness, and is bound to die. Language is possible only in society, and only there is it needed as a means by which members may understand one another. All social animals possess some means of understanding each other, otherwise they would not be able to execute certain plans conjointly. The sounds that were necessary as a means of communication for the primitive man while at his tasks must have developed into names of activities, and later into names of things. The use of tools also presupposes a society, for it is only through society that attainments can be preserved. In a state of isolated life every one has to make discoveries for himself; with the death of the discoverer the discovery also becomes extinct, and each has to start anew from the very beginning. It is only through society that the experience and knowledge of former generations can be preserved, perpetuated, and developed. In a group or body a few may die, but the group, as such, does not. It remains. Knowledge in the use of tools is not born with man, but is acquired later. Mental tradition, such as is possible only in society, is therefore necessary.