THE 



LONDON AND EDINBURGH 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



CONDUCTED BY ( 



SIR DAVID BREWSTER, K.H. LL.D. F.R.S. L. & E. &c. 

 RICHARD TAYLOR, F.L.S.G.S. Astr.S.Nat.H.Mosc.&c. 



AND 



RICHARD PHILLIPS, F.R.S. L.&E.F.G.S. &c. 



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

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



VOL. X. 



NEW AND UNITED SERIES OF THE PHILOSOPHICAL MAGAZINE, 

 ANNALS OF PHILOSOPHY, AND JOURNAL OF SCIENCE. 



JANUARY-JUNE, 1837. 



LONDON: 



PRINTED BY R. AND J. E. TAYLOR, RED LION COURT, FLEET STREET : 



SOLD BY LONGMAN, REES, ORME, BROWN, GREEN, AND LONGMAN J CADELL; 



BALDWIN AND CRADOCK; SHERWOOD, GILBERT, AND PIPER; SIMI'KIN 



AND MARSHALL; WHITTAKER AND CO.; AND S. HIGHLEY, 



LONDON : BY THOMAS CLARK, AND ADAM AND 



CHARLES BLACK, EDINBURGH; SMITH AND SON, 

 GLASGOW ; HODGES AND m'aRTHUR, DUB- 

 LIN J AND G. W. M. REYNOLDS, PARIS. 



