In the mean time it may be stated, that the tungsten and tellurium are found blended in the same pieces, but whether in mere mixture, or in chemical combination, is not yet quite determined. Many specimens of the tungsten exist without the tellurium, but every piece which has afforded tellurium has also afforded tungsten, and in greater abundance. Even in well defined crystals, both metals have been found in the same crystal, and where the external appearance was homogeneous. In other specimens a difference seems to be apparent, and a proper ore of tellurium appears to be blended with a proper ore of tungsten. This latter ore is the wolfram, composed of oxid of tungsten, or as some choose to say, tungstic oxid combined with iron and manganese. The crystals, however, are octahedral, a fact which we believe is not mentioned of this species by authors, although this form is found in the calcareous tungsten. * * * * * The Bismuth mine in which these ores are found is the property of Mr. Ephraim Lane. Letters addressed, post paid, to him at New Stratford, town of Huntington, Connecticut, will find him through the Post Office; and he will, for a reasonable compensation, pack boxes more or less extensive, for mineralogists and others. As Mr. Lane is by occupation a farmer, and is obliged to blast a quartz gangue in order to obtain his specimens, he cannot be expected to transmit them gratis. His mine, which has been sunk only ten feet, affords native bismuth, native silver, magnetical and common iron pyrites, and copper pyrites, (the two latter crystallized) galena, blende, tungsten, tellurium, &c. It is expected that the shaft will soon be sunk deeper, when probably a more abundant supply of good specimens will be obtained. N. B. The silver and galena are the least abundant. _March 8th, 1819._ FOOTNOTES: [28] Vide Edin. Review for Sept. 1818. p. 374. [29] Referring to the ridges of Greenstone near New-Haven. [30] Or, according to the Wernerian Geologists, Transition? _Editor._ [31] The modesty of the writer has prevented him from applying to the formations which he has well described, the terms _transition_ and _secondary_, which there can be little doubt do in fact belong to them. His strata of highly inclined limestone, appear to belong to the transition class of Werner, and his flat strata, to the secondary. It may be observed in this place, that the specimens alluded to in the text (passim,) appear to be correctly described by Mr. Cornelius, and to justify his geological inferences as far as hand-specimens seen at a distance from their native beds, can form a safe basis for general geological inductions. _Editor._ [32] Copied partly from Manuscripts of the late Dr. Muhlenberg, of Lancaster, Pennsylvania.