THE 



PHILOSOPHICAL MAGAZINE, 



OR 



ANNALS 



OF 



CHEMISTRY, MATHEMATICS, ASTRONOMY, 



NATURAL HISTORY, AND 



GENERAL SCIENCE. 



RICHARD TAYLOR, F.S.A. F.L.S. M.Astr.S.&c. 



AND 



RICHARD PHILLIPS, F.R.S.L.&E.F.L.S.&C. 



"Necaranearun, sane textus ideo melior quia ex se fila gignunt, nee noster 

 vilior quia ex alienis libamus ut apes." Just. Lips. Monit. FolU. lib. i. cap. 1. 



VOL. 11. 



NEW AND UNITED SERIES OF THE PHILOSOPHICAL MAGAZINE 

 AND ANNALS OF PHILOSOPHY. 



JULY-DECEMBER, 1827. 



LONDON: 



PRINTED BY RICHARD TAYLOR, UED LION COURT, FLEET STREET : 



AND SOLD BV LONGMAN. REES, ORMK, BROWN, AND GREEN, CADELL; BALDWIN. 



CEADOCK AND /oY ; Si.ERWOOD. GILBERT, AND PIPER; SIMPKIN 



AND MARSHALL; UNDERWOOD; W. PHILLIPS; HARDING; 



HIGHLEY, LONDON : — AND BY ADAM BLACK, 



EDINBURGH; SMITH AND SON, GLASGOW; 



AND HODGES AND M'ARIHUB, 



DUBLIN. 



