470 tellurium. Geognostic and Geographic Situations. It is generally associated with yellow tellurium-ore, in veins that traverse porphyry, and has been hitherto found only at Nagyag in Transylvania. Use. As it affords gold and silver, it is worked both as a gold and silver ore. Observations. 1. A new ore of Tellurium has been lately found in Norway by Esmark. 2. The celebrated traveller Dr Clarke, in the fourth volume of his Travels, just published, gives a full account of the tellurium mines. ORDER XIV,