This proposition, strange as it seems, is very susceptible of demonstration; we cannot express with clearness in any ancient language, ideas about these three great motives of actual society. I had written a dialogue on this subject, but suppressed it for the purpose of permitting the reader, each in his own way, to think of the matter for himself. There is enough to occupy the mind and display intelligence and erudition during a whole evening. We said above, that the genesiac sense took possession of the organs of all the others; the influence it has exerted over all sciences is not less. When we look closer, we will find that all that is most delicate and ingenious is due to the desire, to hope, or to gratitude, in connexion with the union of the sexes. Such is, indeed, the genealogy of the senses, even the most abstract ones, all being the immediate result of continuous efforts made to gratify our senses. PERFECTNESS OF THE SENSES. These senses, our favorites, are far from being perfect, and I will not pause to prove it. I will only observe, that that ethereal sense--sight, and touch, which is at the other extremity of the scale, have from time acquired a very remarkable additional power. By means of spectacles the eye, so to say, escapes from the decay of age, which troubles almost all the other organs. The telescope has discovered stars hitherto unknown and inaccessible to all our means of mensuration; it has penetrated distances so great, that luminous and necessarily immense bodies present themselves to us only like nebulous and almost imperceptible spots. The microscope has made us acquainted with the interior configuration of bodies; or has shown the existence of a vegetation and of plants, the existence of which we were ignorant of. Animals a hundred thousand times smaller than any visible with the naked eye have been discovered; these animalculae, however, move, feed and multiply, establishing the existence of organs of inconceivable tenuity. Mechanics have multiplied our power; man has executed all that he could conceive of, and has moved weights nature made inaccessible to his weakness. By means of arms and of the lever, man has conquered all nature; he has subjected it to his pleasure, wants and caprices. He has overturned its surfaces, and a feeble biped has become king of creation. Sight and touch, being thus increased in capacity, might belong to some species far superior to man; or rather the human species would be far different had all the senses been thus improved. We must in the meantime remark, that if touch has acquired a great development as a muscular power, civilization has done almost nothing for it as an organ of sensation. We must, however, despair of nothing, but remember that the human race is yet young, and that only after a long series of years can the senses aggrandise their domain.