Without going outside Europe, we have, however, to reckon with at least two other types of very early head-form.
In one of the caves of Mentone known as La Grotte des Enfants two skeletons from a low stratum were of a primitive type, but unlike the Neanderthal, and have been thought to show affinities to the modern negro. As, however, no other Proto-Negroes are indisputably forthcoming either from Europe or from any other part of the world, there is little at present to be made out about this interesting racial type.
In the layer immediately above the negroid remains, however, as well as in other caves at Mentone, were the bones of individuals of quite another order, one being positively a giant. They are known as the Cro-Magnon race, after a group of them discovered in a rock shelter of that name on the banks of the Vezère. These particular people can be shown to be Aurignacian—that is to say, to have lived just after the Mousterian men of the Neanderthal head-form. If, however, as has been already suggested, the Galley Hill individual, who shows affinities to the Cro-Magnon type, really goes back to the drift-period, then we can believe that from very early times there co-existed in Europe at least two varieties; and these so distinct, that some authorities would trace the original divergence between them right back to the times before man and the apes had parted company, linking the Neanderthal race with the gorilla and the Cro-Magnon race with the orang. The Cro-Magnon head-form is refined and highly developed. The forehead is high, and the chin shapely, whilst neither the brow-ridge nor the lower jaw protrudes as in the Neanderthal type. Whether this race survives in modern Europe is, as was said in the last chapter, highly uncertain. In certain respects—for instance, in a certain shortness of face—these people present exceptional features; though some think they can still find men of this type in the Dordogne district. Perhaps the chances are, however, considering how skulls of the neolithic period prove to be anything but uniform, and suggest crossings between different stocks, that we may claim kinship to some extent with the more good-looking of the two main types of palæolithic man—always supposing that head-form can be taken as a guide. But can it? The Pygmies of the Congo region have medium heads; the Bushmen of South Africa, usually regarded as akin in race, have long heads. The American Indians, generally supposed to be all, or nearly all, of one racial type, show considerable differences of head-form; and so on. It need not be repeated that any race-mark is liable to deceive.
We have sufficiently considered the use to which the particular race-mark of head-form has been put in the attempted classification of the very early men who have left their bones behind them. Let us now turn to another race-mark, namely colour; because, though it may really be less satisfactory than others, for instance hair, that is the one to which ordinary people naturally turn when they seek to classify by races the present inhabitants of the earth.
When Linnæus in pre-Darwinian days distinguished four varieties of man, the white European, the red American, the yellow Asiatic, and the black African, he did not dream of providing the basis of anything more than an artificial classification. He probably would have agreed with Buffon in saying that in every case it was one and the same kind of man, only dyed differently by the different climates. But the Darwinian is searching for a natural classification. He wants to distinguish men according to their actual descent. Now race and descent mean for him the same thing. Hence a race-mark, if one is to be found, must stand for, by co-existing with, the whole mass of properties that form the inheritance. Can colour serve for a race-mark in this profound sense? That is the only question here.
First of all, what is the use of being coloured one way or the other? Does it make any difference? Is it something, like the heart-line of the hand, that may go along with useful qualities, but in itself seems to be a meaningless accident? Well, as some unfortunate people will be able to tell you, colour is still a formidable handicap in the struggle for existence. Not to consider the colour-prejudice in other aspects, there is no gainsaying the part it plays in sexual selection at this hour. The lower animals appear to be guided in the choice of a mate by externals of a striking and obvious sort. And men and women to this day marry more with their eyes than with their heads.
The coloration of man, however, though it may have come to subserve the purposes of mating, does not seem in its origin to have been like the bright coloration of the male bird. It was not something wholly useless save as a means of sexual attraction, though in such a capacity useful because a mark of vital vigour. Colour almost certainly developed in strict relation to climate. Right away in the back ages we must place what Bagehot has called the race-making epoch, when the chief bodily differences, including differences of colour, arose amongst men. In those days, we may suppose, natural selection acted largely on the body, because mind had not yet become the prime condition of survival. The rest is a question of pre-historic geography. Within the tropics, the habitat of the man-like apes, and presumably of the earliest men, a black skin protects against sunlight. A white skin, on the other hand—though this is more doubtful—perhaps economizes sun-heat in colder latitudes. Brown, yellow and the so-called red are intermediate tints suitable to intermediate regions. It is not hard to plot out in the pre-historic map of the world geographical provinces, or "areas of characterization," where races of different shades corresponding to differences in the climate might develop, in an isolation more or less complete, such as must tend to reinforce the process of differentiation.
Let it not be forgotten, however, that individual plasticity plays its part too in the determination of human colour. The Anglo-Indian planter is apt to return from a long sojourn in the East with his skin charged with a dark pigment which no amount of Pears' soap will remove during the rest of his life. It would be interesting to conduct experiments, on the lines of those of Professor Boas already mentioned, with the object of discovering in what degree the same capacity for amassing protective pigment declares itself in children of European parentage born in the tropics or transplanted thither during infancy. Correspondingly, the tendency of dark stocks to bleach in cold countries needs to be studied. In the background, too, lurks the question whether such effects of individual plasticity can be transmitted to offspring, and become part of the inheritance.
One more remark upon the subject of colour. Now-a-days civilized peoples, as well as many of the ruder races that the former govern, wear clothes. In other words they have dodged the sun, by developing, with the aid of mind, a complex society that includes the makers of white drill suits and solar helmets. But, under such conditions, the colour of one's skin becomes more or less of a luxury. Protective pigment, at any rate now-a-days, counts for little as compared with capacity for social service. Colour, in short, is rapidly losing its vital function. Will it therefore tend to disappear? In the long run, it would seem—perhaps only in the very long run—it will become dissociated from that general fitness to survive under particular climatic conditions of which it was once the innate mark. Be this as it may, race-prejudice, that is so largely founded on sheer considerations of colour, is bound to decay, if and when the races of darker colour succeed in displaying, on the average, such qualities of mind as will enable them to compete with the whites on equal terms, in a world which is coming more and more to include all climates.
Thus we are led on to discuss race in its mental aspect. Here, more than ever, we are all at sea, for want of a proper criterion. What is to be the test of mind? Indeed, mind and plasticity are almost the same thing. Race, therefore, as being the stiffening in the evolution of life, might seem by its very nature opposed to mind as a limiting or obstructing force. Are we, then, going to return to the old pre-scientific notion of soul as something alien to body, and thereby simply clogged, thwarted and dragged down? That would never do. Body and soul are, for the working purposes of science, to be conceived as in perfect accord, as co-helpers in the work of life, and as such subject to a common development. Heredity, then, must be assumed to apply to both equally. In proportion as there is plastic mind there will be plastic body.