In our own species all this is changed. We have been so taken up with the phenomena of masculinity and femininity, that our common humanity has largely escaped notice. We know we are human, naturally, and are very proud of it; but we do not consider in what our humanness consists; nor how men and women may fall short of it, or overstep its bounds, in continual insistence upon their special differences. It is "manly" to do this; it is "womanly" to do that; but what a human being should do under the circumstances is not thought of. The only time when we do recognize what we call "common humanity" is in extreme cases, matters of life and death; when either man or woman is expected to behave as if they were also human creatures. Since the range of feeling and action proper to humanity, as such, is far wider than that proper to either sex, it seems at first somewhat remarkable that we have given it so little recognition. A little classification will help us here. We have certain qualities in common with inanimate matter, such as weight, opacity, resilience. It is clear that these are not human. We have other qualities in common with all forms of life; cellular construction, for instance, the reproduction of cells and the need of nutrition. These again are not human. We have others, many others, common to the higher mammals; which are not exclusively ours--are not distinctively "human." What then are true human characteristics? In what way is the human species distinguished from all other species? Our human-ness is seen most clearly in three main lines: it is mechanical, psychical and social. Our power to make and use things is essentially human; we alone have extra-physical tools. We have added to our teeth the knife, sword, scissors, mowing machine; to our claws the spade, harrow, plough, drill, dredge. We are a protean creature, using the larger brain power through a wide variety of changing weapons. This is one of our main and vital distinctions. Ancient animal races are traced and known by mere bones and shells, ancient human races by their buildings, tools and utensils. That degree of development which gives us the human mind is a clear distinction of race. The savage who can count a hundred is more human than the savage who can count ten. More prominent than either of these is the social nature of humanity. We are by no means the only group-animal; that ancient type of industry the ant, and even the well-worn bee, are social creatures. But insects of their kind are found living alone. Human beings never. Our human-ness begins with some low form of social relation and increases as that relation develops.