OR, MAGAZINE OF CHEMISTRY, MINERALOGY, MECHANICS, NATURAL HISTORY, AGRICULTURE, AND THE ARTS. BY THOMAS THOMSON, M.D. F.R.S. L. & E. F.L.S. &c. MEMBER OF THE GEOLOGICAL SOCIETY, OF THE WERNERIAN SOCIETY, AND OF THE IMPERIAL Printed by C. Baldwin, New Bridge-street; FOR ROBERT BALDWIN, PATERNOSTER-ROW. SOLD ALSO BY W. BLACKWOOD, EDINBURGH; AND J. CUMMING, DUBLIN, |