A SERIES of EXPERIMENTS ON THE SPARRY FLUOR. SECTION I. Experiments on the Sparry Fluor. T H E Sparry Fluor, or Fluor Spatofus of Cronstedt’s Mineralogy, is called by Wallerius Glafs-Spar, or Spa turn folidum plus minus pellucidum, particuhs non dif- tingtiibilibus. Woltersdorf, in his Syjlema Mtnerale, gives it the name of Spa turn Vitrefcens, and defcribes it in the following manner: Lapis figura ft? colore varius, fragmentis rhomboidalibus diapbanis reliqua fpati genera duritie antecedens. In Forster’s Mineralogy it is called Vttrefcent Spar (Spatum Vitrefcens) ■, and the great Dr. Linnaeus mentions it in his 12th edition of his Syjlema Nature, by the name of Muria Chryfolampis; and defcribes it, Muria lapidofa fubquartzofa aggregata fparfa fixa. The Experi ments of Mr. Scheele were chiefly made upon a green fort of this Sparry Fluor, from Garpen- berg, in the province of Dalerne•, and upon a white kind, from Gillof, in the province of Scania. This