Such are briefly the leading and fundamental facts that constitute the mental organism and distinguish the intellectual character of races, that separate white men and negroes by an interval broader and deeper than in any other forms of humanity, and render an attempted social equality not merely a great folly but a gross impiety. As has been stated, in exact proportion to the volume of brain, relatively with the size of body in men and animals, there is intelligence, and as the cerebrum or anterior portion predominates over the cerebellum or posterior portion, there is a corresponding predominance of intellectualism over animalism in the human races. The negro brain in its totality is ten to fifteen per cent. less than that of the Caucasian, while in its relations—the relatively large cerebellum and small cerebrum—the inferiority of the mental organism is still more decided; thus, while in mere volume, and therefore in the sum total of mental power, the negro is vastly inferior to the white man, the relative proportion of the brain and of the animal and intellectual natures adds still more to the Caucasian superiority, while it opens up before us abundant explanations of the diversified forms in which that superiority is continually manifested. There are no terms or mere words that enable us to express the absolute scientific superiority of the white man. We can only measure it, or indeed comprehend it, by comparison, but this will be sufficiently intelligible when it is said that the past history and present condition of both races correspond exactly with the size and form of the brain in each. The science, the literature, the progress, enlightenment and intellectual grandeur of the Caucasian from the beginning of authentic history to this moment, and which have accompanied him from the banks of the Nile to those of the Mississippi, are all fitting revelations of the Caucasian brain, while the utter absence of all these things—the long night of darkness that enshrouds the negro being, and which is only broken in upon when in juxtaposition and permitted to imitate his master, is the result or necessity of his mental organism.