The London, Edinburgh and Dublin philosophical magazine and journal of science . icular attention of Berzeliusf. One of these being exa-mined by the blowpipe, proved to be molybdate of lead. Theother portion was an oxido-chloride of lead. This, so far as I know, is the only published record of theoccurrence of this substance in Britain. Lately a new pit wassunk for some 30 fathoms at the South of Scotland Mines atLackentyre, near Gateshead in Kirkcudbrightshire ; and amongseveral interesting minerals brought me thence by Mr. JamesRussel of Airdrie, there was a single specimen of the molybdate.
The London, Edinburgh and Dublin philosophical magazine and journal of science . icular attention of Berzeliusf. One of these being exa-mined by the blowpipe, proved to be molybdate of lead. Theother portion was an oxido-chloride of lead. This, so far as I know, is the only published record of theoccurrence of this substance in Britain. Lately a new pit wassunk for some 30 fathoms at the South of Scotland Mines atLackentyre, near Gateshead in Kirkcudbrightshire ; and amongseveral interesting minerals brought me thence by Mr. JamesRussel of Airdrie, there was a single specimen of the associated minerals are galena, carbonate and phosphate oflead, and cupreous calamine; the molybdate occurs in well-pro-nounced and unusually brilliantly polished crystals of about one-eighth of an inch in size;the forms are csn andcsnm; the faces n andm are very narrow: the *crystals are thin, transpa-rent, and bright yellow. The pit in which thisspecimen was found proved Lackentyre. unproductive, and has been abandoned; there is thus little hopeof others being XL. On the Heat disengaged by Induction-currents, and on therelation between this disengagement of Heat and the mechanicalforce employed to produce it. By M. E. EdlundJ. WHEN a closed conducting wire is brought near a galvaniccurrent, an induced current is produced in the former,the direction of which is such that it would give rise to a repul- * Communicated by the Author. t Kong. Vet. Acad. Handl. 1823, p. 184. X The original memoir was published in the Comptes Rendus de IAca-demie des Sciences de Stockholm, 1864, p. 79. The above article is thetranslation of an abstract contained in the Bibliotheque Universelle, Decem-ber 20, 1865. 254 M. E. Edlund on the Heat disengaged sion between the two currents. If, on the contrary, the conduc-tor is removed, the induced current is in the opposite direction,from which would result an attraction between the two , therefore, in the two cases is ac
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