SCIENTIFIC MEMOIRS, 



SELECTED FROM 



THE TRANSACTIONS OF 



FOREIGN ACADEMIES OF SCIENCE, 



AND FROM 



rOEEIGN JOURNALS. 



NATURAL PHILOSOPHY. 



EDITED BY 



JOHN TYNDALL, Ph.D., F.R.S., / , 



AND 



WILLIAM FRANCIS, Ph.D., F.R.A.S., F.L.S. '| 



LONDON: 



TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. 

 Printers and Publishers to the University of London. 



1853. 



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