We shall only have a natural and rational classification by comparing entire individuals one with the other.[338] To this we must come; we must study at one and the same time the height, the skin with its dependencies, and, above all, the character of the countenance, the attitude, the _facies_, and the _habitus_ of different races, which Caldwell called “the variety discoverable in the complexion and feature, the figure and stature of the human race;[339]” this _something_ is explained in one word, which we call _type_, about which we are never mistaken, and which makes us say, “This is a man from the south, that is a man from the north; this is a Mongolian, that an Indian.”[340] By this means alone we can form natural groups; difficulties will, doubtless, be great at the beginning, but light will come little by little, and time will teach us surely to distinguish certain distinctive characteristics, whose expression will be gradually more and more simple. This is a work for the future. Anthropology regarding man as a whole, classifiers ought not to neglect his psychological value. Although craniology is only an indirect appreciation of the same, few had ever thought, Linnæus excepted, of using the purely intellectual characteristics of races in order to assist them in classification, when all at once the American school gave an immense importance to these characteristics, and placed psychological varieties above all the material differences which can be observed in the configuration of the bony case of the skull. The American school has gone too far, for it is tangible forms especially which must furnish specific characteristics in the animal kingdom. However this may be, we may willingly give a secondary value to the intellectual classification of the human race, although _data_ are still wanting in order to establish one which can be considered as complete. We will even add that the characteristics of this order are the more authentic and the more precious since they are not the expression of a given moment, nor that of a certain number of individuals. They belong to a whole race.