53 



nients of the Ordnance and Admiralty. Vol. I., Part 2. 



(1842-4), 4to. — From the British Government. 

 Annales des Mines. Tom. II. (1847); Tom. IV., Liv. 1, 6, 6, 



(1833) ; Table des Matieres des l'* et 2^ Series, 1816-30 ; 



Tom. XIV., Liv. 6 (1848); Tom. XIX., Liv. 1, 2, 3, 



(1841); Tom. XX., Liv. 4, 5, 6 (1841) ; 8vo.— i^-rom the 



Ecole des Mines. 

 Journal of the Statistical Society of London. Vol. XIV., Part 1, 



8vo. — From the Society. 

 The Geological Observer. By Sir Henry T. de la Beche. 8vo. 



— From the Author. 

 Journal of the Asiatic Society of Bengal. No. 214. 8vo. — From 



the Society. 



Monday, 7th April 1851. 



Sir DAVID BREWSTER, K. H., Vice-President, in 

 the Chair. 



The following Communications were read : — 



1. On the Geology of the Eildon Hills. By Professor 

 J. D. Forbes. 



The author first refers to a paper by Mr Milne, in the 15th 

 Volume of the Edinburgh Transactions, on the Geology of Rox- 

 burghshire, in which the general features of this district are accu- 

 rately described. The present paper contains a notice of some 

 minuter particulars regarding the formation of the Eildon group and 

 their boundaries obtained by detailed personal examination in 1849. 



The remarkable general parallelism of the strata of greywack^ 

 which forms the basis of the geology of the neighbourhood, is first 

 particularly insisted upon. The intrusive rocks, chiefly felspathic, 

 which abound near Melrose, have but little, if at all, disturbed the 

 general strike and inclination of the greywacke rocks, the former 

 being in a direction nearly east and west, and the latter nearly ver- 

 tical. The triple Eildon Hill is composed principally of brownish 

 red felspar porphyry, sometimes resembling clink-stone, at other 

 times containing quartz; the south-western hill shews vertical columns 

 of the same substance. The author was able to trace the strata of 

 greywacke to a great height on the north-western face of the two 



