1824.] Geological Society. 153 



on the 24th of March next ; by Francis Baily, Esq. FRS. and 

 VP. Ast. Soc. 



This paper we have obtained permission to print at full length ; 

 see p. 107 of our present number. 



GEOLOGICAL SOCIETY. 



Nov. 7. — A letter was read, dated May 10, 3 823, from George 

 Cumberland, Esq. Hon. Mem. GS. " On a Fossil of the Chalk," 

 accompanied by a drawing. 



A letter was read, dated July 14, 1823, from George Cumber- 

 land, Esq. Hon. Mem. GS. " On a new Species of Encrinus 

 found in the Mountain Limestone, near Bristol." 



A notice was read, containing an Analysis of the Aluminiteof 

 St. Helena, by Dr. Wilkinson, of Bath : communicated by Col. 

 Wilks, MGS. 



On this analysis Col. Wilks observes, that there is a remarka- 

 ble difference between the component parts of the aluminite of 

 St. Helena, and the sub-sulphate of alumine found at Newhaven 

 and Halle, as given by Phillips, p. 111. 



A paper was read on the Geology of Parts of the Islands of 

 Madeira, Porto Santo and Baxo, by T. E. Bowdich, Esq. 



From the investigations of Mr. Bowdich, it appears that such 

 parts of these islands as he examined consist principally of hori- 

 zontal strata of limestone and sandstone containing fossils, inter- 

 sected, and sometimes capped by basalt. 



Nov. 21 . — An extract of a letter was read from the Rev. Lans- 

 down Guilding, MGS. containing an Account of a Fossil found 

 in the Blue Lias at the Berkeley Canal, near Gloucester, accom- 

 panied by the Fossil. 



A paper was read, " On the Lias of the Coast in the Vicinity 

 of Lvme Regis, Dorset," by H. T. de la Beche, Esq. FRS. FLS, 

 and MGS. 



In a former communication in the first part of vol. i. second 

 series, of the Society's Transactions, the author had presented an 

 outline of the geological features of the coast near Lyme Regis. 

 The present paper is intended as supplementary, and the sections 

 before published are referred to. Mr. de la Beche now enters 

 into a detailed description, illustrated by a drawing, of the various 

 strata composing the lias formation. 



This formation consists of about 110 feet of lias, composed of 

 more than 72 beds of limestones alternating with the same num- 

 ber of marl beds, surmounted by about 500 feet of lias marls. 

 An account is subjoined of the various fossil shells and other 

 organic remains luund in the lias, accompanied with several 

 descriptive drawings. 



Dec. 5. — A paper was read, entitled " Remarks on the Geo- 

 logy of Siam and Cochin China, and certain Islands in the 

 Indian Archipelago, and Parts of the adjacent Continent," by 

 John Crawford, Esq. MGS. 



