370 Proceedings of Societies. 



the geology of Auvergne, &c. we expect to be able to lay before our read- 

 ers some account of those parts of the rolcanic district which Mr Scrope 

 did not examine, and some of which liave, we believe, never been describ- 

 ed. The whole valley of the Loire, for example, from Roanne southwards 

 up to Le Puy, the Canton of D'Aubrac, and the southern part of the Can- 

 tal, will OQ this account attract his particular attention. 



Art. XXX VI.~ proceedings OF SOCIETIES. 



1. Royal Society of Edinburgh, 



May 7.— The following gentlemen were elected Members: 



Alexander Copland Hutchison, Esq. Surgeon to his Majesty's 

 Dock-yard, Sheerness 



George Swinton, Esq. Secretary to the Government, Calcutta. 



Professor Wallace read a paper on the quadrature of the conic sec- 

 tions, and the calculation of logarithms. 



There was read a paper by Dr Brewster on the theory and construc- 

 tion of polyzonal lenses, and their combination with mirrors, for the 

 purposes of illumination in light-houses. 



The following papers were communicated to the Society : — 

 '- 1. Observations on the structure of the fruit in the order Cucurbitacea?, 

 by Francis Hamilton, M. D. F. R. S. London and Edinburgh. 



9. Account of Oxahveriie, a new mineral from Oxahver in Iceland, by 

 Dr Brewster. Printed in Number xiii. p. 115. 



3. Analysis of Oxahveriie, by Dr Edward Turner. Printed in Nurr- 

 ber xiii. p. 118 



The Society adjourned till November. 



y. Proceedings of the Society for Promoting the Useful Arts in Scotland. 



April 3. — The following Gentlemen were elected Members : 

 Ordinary. 

 Mr Charles Chalmers, Edinburgh. 

 Associates. 

 Alexander Nasmyth, Esq. Edinburgh. 

 Mr James Clark, mechanist, Edinburgh. 

 Mv .1. A. Ventress exhibited and described a stereoraeter on a new 

 construction, for measuring the specific gravity of powders, as well as solid 

 bodies. See last Number, p. 143. 



Mr LiZARS read a notice on preventing forgery in bank notes, and ex- 

 hibited specimens of notes executed by himself. 



Dr Brewster communicated a notice respecting the theory of Barker's 

 Mill, by Davtes Gilbert, Esq. M. P. V. P. R. S. who undertook the in- 

 vestigation, in consequence of that society having off?i-ed a premium on 

 the best set of experiments on that machine. 

 Sir Samuel Stirling Bart. e^Ujibited find described the model of a 



i 



