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i k A N p A S Y METHOD O F ASSAYING and CLASSING MINERAL SUBSTANCES, CONTAINING Plain and Easy Instructions FOR ANY PERSON TO EXAMINE T'he Products of his own Land, or fuch as are obvious in Excurfions or Travels in foreign Countries, with out having a complete Chemical Apparatus. TO WHICH IS ADDED, A SERIES OF EXPERIMENTS ON THE Fluor SpatofuSy or Sparry Fluor. ABSTRACTED FROM THE Memoirs of the Royal Swedish Academy of Sciences for the Year iyyi. By JOHN REINHOLD FORSTER, F. R. S. Multa funt qua ejfe ccnceditnus : qualia fint ignoramus. Seneca, Nat. Quaeft. 1. vii. c. 24. LONDON: Printed for E. and C. Dilly, in the Poultry. mdcclxxii.