Two summers ago we visited the localities in Massachusetts which were famous in the days of Hitchcock and Webster. We found that the beryls occurred in a very coarse granite, where the quartz appeared in masses and the felspar in huge crystals. These also occur in finer granite, and exhibit no indications of veins or connection with each other. They are few in number, and are soon exhausted by blasting, being generally very superficial. After removing several tons of the rock at the locality at North Royalston, where the beryls appear on the summit of the loftiest hill, our labors were at length rewarded with two beautiful crystals. One of them was a fine prism an inch in diameter, of perfect transparency and of a deep sea-green color, which, however is far from being similar to the transcendent hue of the Granada emeralds, which exhibit an excess of neither blue nor yellow. The other was yellowish-green, resembling the chrysoberyls of Brazil. Other but imperfect crystals were brought to light, some fragments of which exhibited the deepest golden tints of the topaz, and others the tints of the sherry-wine colored topazes of Siberia. Magnificent crystals have been found in these localities in times long past, and from the fragments and sections of crystals found in the débris of early explorations we observed the wide range of color and the deep longitudinal striae which characterize the renowned beryls from the Altai Mountains, in Siberia. Lively sea- and grass-green, light and deep yellow, also blue crystals of various shades, have been found here. At the quarries on Rollestone Mountain in Fitchburg beryls of a rich golden color have been blasted out. Some of these approach the chrysoberyl and topaz in hardness and hue. Others so closely resemble the yellow diamond that they may readily be taken for that superior gem. The refractive power of these yellow stones is remarkable, and the goniometer will probably reveal a higher index than is accorded to all the varieties of beryl by the learned Abbé Haüy. Beautiful transparent beryls have been found among the granite hills of Oxford county in Maine, and the late Governor Lincoln nearly half a century ago possessed a splendid crystal which would have rivaled the superb prism found at Mouzzinskaia, and which the Russians value so highly. The extended and unexplored ledges of granite which rise from the shores of the ocean at Harpswell in Maine, and stretch north-westward for nearly a hundred miles, quite to the base of the White Mountain group, are not only rich in beryls, but they contain many of the rarest minerals known to the mineralogist. And perhaps there is no other field of equal extent in the country which offers to the mineralogist such a harvest of the rare and curious productions of the mineral kingdom.