ANNALS OF PHILOSOPHY; 



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. 



REGIOS PROFESSOR OF CHEMISTRY IN THE DNIVERSITY OF GLASGOW, 



UCMBIilR OF THE GEOLOGICAL SOCIETY, OP THE WERNERIAN SOCIETY, AND OP THE 



IMPERIAL ItfEDICO-CHIKtJRGICAL ACADEMY OF PETEKSBDHGH. 



VOL. XV. 



JANUARY TO JUNE, 1820, 



EonDoit : 



Printed bu C. Ualdwiti, New Biidge-street; 



FOR BALDWIN, CRADOCK, AND JOY, 



47, PATER NOSTEK -now. 



1 8'20. 



