248 



The votes of the Fellows present having been collected, the fol- 

 lowing gentlemen were declared duly elected : 



Thomas Graham Balfour, M.D. 

 Edward Mounier Boxer, Captain 



R.A. 



Frederick Currey, Esq. 

 David Forbes, Esq. 

 Alfred Baring Garrod, M.D. 

 William Henry Harvey, M.D. 

 The Rev. Samuel Haughton. 

 Henry Hennessy, Esq. 



David Livingstone, LL.D. 

 John Lubbock, Esq. 

 Henry Darwin Rogers, LL.D. 

 William Scovell Savory, Esq., M.B. 

 Warington Wilkinson Smyth, Esq. 

 Lieut. -Col. Andrew Scott Waugh, 



B.E, 

 Thomas Williams, M.D. 



June 10, 1858. 



The LORD WROTTESLEY, President, in the Chair. 

 The following Gentlemen were admitted into the Society : - 



Thomas Graham Balfour, M.D. ; Frederick Currey, Esq.; Alfred 

 Baring Garrod, M.D. ; John Lubbock, Esq. ; William Scovell Savory, 

 Esq., M.B.; Warington Wilkinson Smyth, Esq.; Thomas Williams, 

 M.D. 



The following communications were read : 



I. "On the formation of Continuous Tabular Masses of Stony 

 Lava on steep slopes ; with Remarks on the Mode of Ori- 

 gin of Mount Etna, and the Theory of ' Craters of Eleva- 

 tion/ '- By Sir CHARLES LYELL, F.R.S., &c. Received 

 June 10, 1858. 



(Abstract.) 



The question whether lava can consolidate on a steep slope, so as 

 to form strata of stony and compact rock, inclined at angles of from 

 10 to more than 30, has of late years acquired considerable im- 

 portance, because geologists of high authority have affirmed that 

 lavas which congeal on a declivity exceeding 5 or 6 are never con- 

 tinuous and solid, but are entirely composed of scoriaceous and frag- 

 mentary materials. From the law thus supposed to govern the con- 

 solidation of melted matter of volcanic origin, it has been logically 

 inferred that all great volcanic mountains owe their conical form prin- 

 cipally to upheaval or to a force acting from below and exerting an 



