On every hand philosophy still continues to push her conquests, and discoveries crowd upon us. EHRENBERG has opened to us a new world in his use of the microscope; those little insects, thousands of which might stand on a needle's point, show to us how multiplied and how minute the mechanism of the parts of living things may be. By feeding these creatures on the purest carmine, and then bathing them in distilled water, he has seen through their transparent bodies parts which might rival for complexity the organs of the largest animals. In another branch, FARADAY has explained all the phenomena of voltaic electricity, in a series of experimental researches, unrivalled since the time when Davy demonstrated that the alkalies and earths were metallic oxides. In France, DUTROCHET has built up the doctrine of Endosmose and capillary attraction, which has been extended in this country, and furnished some remarkable results. The newly detected facts of esormorphism and plescomorphism, are shaking chemistry and mineralogy to their very foundation. The discovery of the mode of polarising light—a subject upon which I propose to dwell at some length, if time permits—has given us, to use the words of an eloquent writer, new and infinitely refined perceptions of touch. We are enabled, with mathematical precision, and demonstrative certainty, to assign the exact form of atoms, millions of times beyond microscopic power. We tremble upon the brink of discovering the elementary constitution of the material world. We can feel as it were the molecules of light itself, that most subtle of all fluids. We can almost perceive their sides and their ends, and can actually control, regulate and arrange the constituent parts of a _sunbeam_! LIEBER'S MEMORIAL. _Memorial of Francis Lieber, Professor of History and Political Economy in the South Carolina College, relative to Proposals for a Work on the Statistics of the United States._