Men of genius may be ranked as follows: Sanguine-nervous are usually great writers, divines, musicians, or artists. Sanguine-bilious, great generals, politicians, statesmen, inventors, business men, or distinguished in any calling requiring much energy and industry. Sanguine-lymphatic are frequently persons of great talent, enterprise, and distinction, and are generally long lived; but they seldom make any considerable display of their abilities, or become men of mark. Lazy, inefficient and irresolute people, are in most cases constitutionally so from a lack of sanguinity in their temperaments. Some men and women are so constituted that they never can rise above drudges in society; for if they are industrious they have no confidence in themselves. THE NATURAL LAWS OF MARRIAGE, AND OF THE TEMPERAMENTS. It is well known that marriages between near relatives produce unhealthy and imperfect children, but the causes of such a result are not generally understood. These causes extend far beyond the circle of a family, for it is quite as improper for two persons of the same temperament to marry, as it would be for a brother and a sister. The laws of the Temperaments of the human family may be enumerated as follows: 1st. When both parties to a marriage are constitutionally the same, there will probably be no children. 2d. The vital elements are incompatible with each other, and if children are born to parents who are alike in this respect, they will probably be idiotic, or rachitic.[1] 3d. When parties who marry are nearly alike—if their temperaments differ only in part—they will have children who may live to adult age, but who will then probably die of tubercular phthisis (consumption). In illustration of this, I have known whole families of children to be taken off by consumption between the ages of twenty-two and twenty-seven years, where this disease had not previously existed in the families of the parents or their progenitors. 4th. If the constitutions of a married couple assimilate to the extent of one-half, their children will be apt to die before the first seven years. The diseases of such children are tubercles in the glands of the intestines, or in the membranes of the brain. 5th. When persons marry who are alike in temperament, and whose constitutions materially differ, a majority of their children will be still-born, and none will probably live to be two years old. 6th. When one of the parties to a marriage is exclusively vital, and the other similar, but of a nervous and melancholy turn, the children will generally be promising. 7th. To produce smart and healthy children, one of the parties should be of sanguine-bilious temperament, with good vitality, and the other of a quiet, lymphatic turn.