Geological Society. 55 



roots of negative quantities ;" by the Rev. John Warren. Another 

 paper was also read, descriptive of a case of a tumour removed from 

 the head by Sir Everard Home. 



June 18. — A paper was read " On the conversion to a vacuum 

 of the experiments with Captain Kater's pendulum ;" by Captain 

 Sabine, Sec. F.R.S. 



The President in taking a sessional farewell of the Fellows, con- 

 gratulated the Society upon its continued prosperity, and paid a 

 just tribute to the memory of Wollaston, Young, and Davy, whose 

 loss the Royal Society felt in a particular manner: but, said the 

 President, whilst we lament their death, let us hope that their 

 mantle will descend upon others. 



GEOLOGICAL SOCIETY. 

 March 6.— S. P. Pratt, Esq., of Lansdown Place West, Bath; and 

 the Rev. Robert Everest, M.A., of Devereux- Court, Temple, were 

 elected Fellows of this Society. 



An account of a remarkable fossil-plant in the coal-formation of 

 Yorkshire ; by John Lindley, Esq., F.G.S., F.R.S., &c., and Professor 

 of Botany in the University of London, was read. 



This plant was described as a fern, resembling, in most respects, the 

 Trichomanes reniforme, a recent species found in New Zealand, but 

 differing in the nature of its venation. It was said to exhibit distinct 

 and unequivocal traces of the marginal fructification peculiar to the 

 genus Trichomanes. After comparing it with the fossils comprehended 

 by M. Adolphe Brongniavt in his genus Cyclopteris, and showing 

 that it was not referable to any known species of that group, the au- 

 thor roncluded by assigning to it a specific character, and the name 

 of Trichomanes rotundatum. 



The reading of a paper "On the remains of Quadrupeds which 

 have been discovered in the Marine and Freshwater Formations of the 

 Peninsula of Ituiy ;" bv J. B. Pentland, Esq., was begun. 



March20.— R.W. Blcncowe, Esq., M.A., of 10, Gloucester-Place; 

 R. Otway Cave, Esq., M.P., of 30, Upper Grosvenor-strcet ; Captain 

 Samuel Edward Cook, R.N., of Newton, Northumberland ; Robert 

 Daubenv, Esq., of Cork-street; George Lowe, Esq., of Highgate; and 

 J. P. Fe'aron, Esq., of I , Crown-Office-Row, Temple,— were elected 

 Fellows of this Society. 



A paper was read, ''On the Tertiary and Secondary Rocks forming 

 the Southern Flank of the Tyiolesc Alps, near Bassano ;" by Itode- 

 rick Impey Murchison, Esq., Sec. G.S., F.R.S., kc* 



The tertiary, or sub-alpinc rocks which fringe the southern extre- 

 mity of the Tyrolcsc Alps, between the rivers Brentaand Piave, may 

 be said to divide themselves into two great natural groups of very 

 different ages. 



iKt. — An outer, or younger zone composed of conglomerates with 



subordinate beds of yellow sand and blue marl containing shells, 



which, from a limited number collected by the autiior, seem to be 



• Mr. Murrhison's paper will i)c found in our last number, at p. 401.— 



E"'^- identical 



