BY the death of Signor Quintino Sella, to which we briefly referred last week, Italian science loses one of her strongest supporters and most earnest students. Although some of the best years of his life were devoted to statesmanship, his early writings on mineralogy were of sufficient solidity to establish for their author a very high reputation. These mineralogical memoirs, contributed chiefly to the Royal Academy of Sciences of Turin, were distinguished by a profound knowledge of crystallography. When the Geological Survey of Italy was about to be established, Signor Sella was commissioned to visit most of the European countries where Surveys were in operation, and in 1861 he presented to Signor Cordova, then Minister of Agriculture, Industry, and Commerce, a valuable report, “Sul Modo di fare la Carta Geo-logica del Regno d'ltalia.” In collecting materials for that report he spent some time in this country, and took the warmest interest in the work of the Geological Survey. Ten years later he prepared an elaborate report on the mineral wealth of Sardinia. When the International Geological Congress was held at Bologna in 1881, Signor Seila, as one of the most representative scientific men in Italy, was selected to act as the president; and those who had the advantage of attending that meeting carried away with them the most pleasant recollections of his courtesy. Signor Sella died at Biella in Piedmont on the 14th inst.