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.S.A. L.S. G.S. Astr. S. &c. 



AND 



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



44 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. l. 



VOL. III. 



NEW AND UNITED SERIES OF THE PHILOSOPHICAL MAGAZINE 

 AND JOURNAL OF SCIENCE. 



JULY— DECEMBER, 1S33. 



LONDON: 



PRINTED BY RICHARD TAYLOR, RED LION COURT, FLEET STREET 

 Printer to the University of London. 



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

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AND MARSHALL; AND S. HIGHLEY, LONDON: BY ADAM 



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AND G. G. BIENNIS, PARIS. 



