In mineralogy, the work of Cleveland is most distinguished. Shepherd, Mather, Troost, Torrey, and a few others, still pursue mineralogy for its own sake; but, generally, our mineralogists have turned geologists, studying rocks on a large scale, instead of their individual constituents, and vieing with their brethren in Europe in bold and successful generalization, and in the application of physical science to their subject. Maclure was one of the pioneers, and Eaton and Silliman contributed much to the stock of knowledge. This school has given rise to the great geological surveys made or progressing in several of the States. Jackson, in Maine, Hitchcock, in Massachusetts; Vanuxen, Conrad, and Mather, in New York; the Rogerses, in New Jersey, Pennsylvania, and Virginia; Ducatel, in Maryland; Owen and Locke, in the West; Troost, in Tennessee; Horton, in Ohio; the courageous, scientific, and lamented Nicolet, in Missouri, Iowa, and Wisconsin, have made contributions, not only to the geology of our country, but to the science of geology itself, which are conceded to be among the most valuable of the present day. The able reports of Owen and Nicolet were made to Congress, and deserve the highest commendation. In geographical science, the explorations of Lewis and Clark; of Long, Nicolet, and the able and intrepid Fremont; the effective State survey of Massachusetts; the surveys of our public lands; the determination of the boundaries of our States, and especially those of Pennsylvania, by Rittenhouse and Elliott; of part of Louisiana, by Graham and Kearny; of Michigan, by Talcott; and of Maine, by Graham; have gained us great credit. The national work of the coast survey, begun by the late Mr. Hassler, and prosecuted through all discouragements and difficulties by that indomitable man, has reflected honor upon his adopted country, through the Government which liberally supported the work, and through whose aid it is now progressing, under new auspices, with great energy.[6] The lake survey is also now advancing under the direction of Captain Williams, of the Topographical Corps. Among the important recent explorations, is that of the enlightened, untiring, and intrepid Fremont, to Oregon, which fixes the pass of the Rocky Mountains within twenty miles of the northern boundary of Texas. Lieutenant Fremont is a member of the Topographical Corps, which, together with that of Engineers, contains so many distinguished officers, whose labors, together with those of their most able and distinguished chiefs, Colonel Totten and Colonel Abert, fill so large a portion of the public documents, and are so well known and highly appreciated by both Houses of Congress and by the country. The Emperor of Russia has entered the ranks of our Topographical Corps, and employed one of their distinguished members, Captain Whistler, to construct his great railroad from St. Petersburg to Moscow. The travels of our countrymen, Stephens,