A Tragic Termination to Knowledge.—Of all the means of exaltation, human sacrifices have at times done most to elevate man. And perhaps the one powerful thought—the idea of self-sacrificing humanity—might be made to prevail over every other aspiration, and thus to prove the victor over even the most victorious. But to whom should the sacrifice be made? We may already swear that, if ever the constellation of such an idea appeared on the horizon, the knowledge of truth would remain the single but enormous object with which a sacrifice of such a nature would be commensurate—because no sacrifice is too great for it. In the meantime the problem has never been expounded as to how far humanity, considered as a whole, could take steps to encourage the advancement of knowledge; and even less as to what thirst for knowledge could impel humanity to the point of sacrificing itself with the light of an anticipated wisdom in its eyes. When, perhaps, with a view to the advancement of knowledge, we are able to enter into communication with the inhabitants of other stars, and when, during thousands of years, wisdom will have been carried from star to star, the enthusiasm of knowledge may rise to such a dizzy height!