the Israelites were enjoined to preserve the purity of their blood, and there was no higher crime than that of forming alliances with the idolatrous nations surrounding them.  The Brahmins of Hindostan have established upon the same principle the law of caste, by which certain professions were made hereditary.  In this warm climate, where labour is so oppressive, to secure perfection in any series of operations it seems essential to strengthen the powers by the forces acquired from this principle of hereditary descent.  It will at first perhaps strike your mind that the mixing or blending of races is in direct opposition to this principle of perfection; but here I must require you to pause and consider the nature of the qualities belonging to the human being.  Excess of a particular power, which in itself is a perfection, becomes a defect; the organs of touch may be so refined as to show a diseased sensibility; the ear may become so exquisitely sensitive as to be more susceptible to the uneasiness produced by discords than to the pleasures of harmony.  In the nations which have been long civilised the defects are generally those dependent on excess of sensibility—­defects which are cured in the next generation by the strength and power belonging to a ruder tribe.  In looking back upon the vision of ancient history, you will find that there never has been an instance of a migration to any extent of any race but the Caucasian, and they have usually passed from the North to the South.  The negro race has always been driven before these conquerors of the world; and the red men, the aborigines of America, are constantly diminishing in number, and it is probable that in a few centuries more their pure blood will be entirely extinct.  In the population of the world, the great object is evidently to produce organised frames most capable of the happy and intellectual enjoyment of life—­to raise man above the mere animal state.  To perpetuate the advantages of civilisation, the races most capable of these advantages are preserved and extended, and no considerable improvement made by an individual is ever lost to society.  You see living forms perpetuated in the series of ages, and apparently the quantity of life increased.  In comparing the population of the globe as it now is with what it was centuries ago, you would find it considerably greater; and if the quantity of life is increased, the quantity of happiness, particularly that resulting from the exercise of intellectual power, is increased in a still higher ratio.  Now, you will say, ’Is mind generated, is spiritual power created; or are those results dependent upon the organisation of matter, upon new perfections given to the machinery upon which thought and motion depend?’ I proclaim to you,” said the Genius, raising his voice from its low and sweet tone to one of ineffable majesty, “neither of these opinions is true.  Listen, whilst I reveal to you the mysteries of spiritual natures, but I almost fear that with the mortal veil of your