IN a primitive people the mind of one generation precisely repeats the minds of all former generations; the construction of the intellectual nature varies no more, from age to age, than the form of the body or the color of the skin; the generations feel the same emotions, and think the same thoughts, and use the same expressions. And this is to be expected, for the brain is as much a part of the inheritable, material organization as the color of the eyes or the shape of the nose. The minds of…