The white man is least and the negro most affected by external agents, such as climate, time, systems of government, etc. The fourth figure in contrast with the isolated negro of Africa, exhibits a certain degree of improvement, progress, or advance that illustrates the actual capabilities of the race when placed under circumstances favorable to its development. The size of the brain, the actual organism and absolute nature, of course, remains unaltered, just as all these things remain unchanged and unchangeable in the uneducated white laborer of our own times; but the negro, in juxtaposition with the superior race, becomes educated, and all his latent capabilities fully developed. Thus, while the color, the hair, the entire organism is just what it was thousands of years ago, and what it must be forever, or as long as the present order of creation continues, there is a certain modification in the features and still greater changes in the expression. The uncouth and uneducated European laborer contrasted with the educated classes, or with the generality of Americans, exhibits a wide difference, not so much in the features as in the expression; and though the negro in Africa is in a far more natural position, relatively considered, than the European laborer, the negro in our midst exhibits, perhaps, even a greater difference over his isolated brother. And if we suppose, for a moment, that the masses of English laborers were educated, fed on the same fare, and subject to the same circumstances as the English nobles, then we may form a reasonable estimate of the relative advance of the American over the African negro. The former would differ in no respect whatever from the privileged and educated class, and if all the negroes of Africa were brought here or were placed in juxtaposition and natural relation with the superior race, they would exhibit the same characteristics common to our so-called slaves, and the fourth figure in this plate would doubtless present a typical illustration of them. A good many people, ignorant of the laws of organism, suppose that our negro population have made a great advance over the wild and barbarous tribes of Africa, and, as shown by the second and fourth figures in the plate, this is so, but it is only in the outward expression, while the essential nature is ever the same. The negro infant, for example, brought from Africa and placed under existing circumstances in Mississippi, would be represented by the fourth figure, while the infant born here and carried to Africa to grow up with the wild tribes of the interior, would, on the contrary, be illustrated by the second figure of the plate.