4th. How to prevent the whites from securing the lion's share of the labor of the blacks? This is a question which my want of familiarity with the operations of the laboring classes prevents me from answering in a manner satisfactory to myself. Is it not possible to apply to the superintendence of the working negroes something like the system which regulates the duties of the foreman in all our manufacturing establishments? I should like to go on and attempt to devise some scheme in conformity with the convictions I have expressed in these letters. But I have little ability in the way of organizing, and then the subject is so novel that I am not prepared to propose anything very definite. Ever truly yours, LOUIS AGASSIZ. FROM DR. S.G. HOWE. NEW YORK, August 18, 1863. MY DEAR AGASSIZ, I cannot refrain from expressing my thanks for your prompt compliance with my request, and for your two valuable letters. Be assured I shall try to keep my mind open to conviction and to forbear forming any theory before observing a wide circle of facts. I do not know how you got the idea that I had decided in favor of anything about the future of the colored population. I have corresponded with the founders of "La Societe Cosmopolite pour la fusion des races humaines" in France,--an amalgamation society, founded upon the theory that the perfect man is to be the result of the fusion of all the races upon earth. I have not, however, the honor of being a member thereof. Indeed, I think it hardly exists. I hear, too, that several of our prominent anti-slavery gentlemen, worthy of respect for their zeal and ability, have publicly advocated the doctrines of amalgamation; but I do not know upon what grounds. I do, indeed, hold that in this, as in other matters, we are to do the manifest right, regardless of consequences. If you ask me who is to decide what is the manifest right, I answer, that in morals, as well as in mathematics, there are certain truths so simple as to be admitted at sight as axioms by every one of common intelligence and honesty. The right to life is as clear as that two and two make four, and none dispute it. The right to liberty and to ownership of property fairly earned is just as clear to the enlightened mind as that 5 x 6 = 30; but the less enlightened may require to reflect about it, just as they may want concrete signs to show that five times six do really make thirty. As we ascend in numbers and in morals, the intuitive perceptions become less and less; and though the truths are there, and ought to be admitted as axiomatic, they are not at once seen and felt by ordinary minds.