460 Geological Societ'tf. 



kenny, and of Westmoreland, Cumberland, and Durhatn^ 

 together uilh magnesian limestone, sometimes in separate 

 beds, and ohen in distinct patches, inclosed within the other. 

 This magnesian limestone, except in a single instance, ap- 

 peared destitute of organic remains, but in some places in- 

 closes roundish nodules of glassy quartz. 



In one or two places the limestone is covered by an un- 

 slratified mass of transition amygdaloid ; the base of which 

 is a greenish wacke, containing nodules of lamellar cal- 

 careous spar invested by a thin coating of iron pyriles. 



Of the floetz or secondary rocks the only one that occurs 

 is the oldest sandstone, some of the beds of which are so 

 coarse-grained as to merit the name of conglomerate, in 

 which case it consists chiefly of fragments of quart z, with a 

 few scraps of decayed slate, and a little iron pyrites. The 

 colour of the sandstone is red, or grayish while; it is more 

 or less slaty, according to the proportion of mica thai it con- 

 tains: it lies unconformably over the gray wacke, and dips 

 NW at an angle varying from 35° to 13°. 



On the sea shore, and on the slopes of several of the 

 mountains, are loose blocks, in great abundance, of granite, 

 of mica slate, and of porphyry. 



The only mines in the island are at Loxey, at Foxdale, 

 and at Brada head : at present however they are all aban- 

 donedi The ore is galena mixed with pyrites, and with the 

 carbonates of lead and of copper. The rock through which 

 the veins run is gray wacke: but at Foxdale they have 

 been followed into the subjacent granite. 



The paper is terminated by two tables. Of these the 

 first is a register of the temperature of several springs as- 

 certained during the month of June 1811. From this it 

 appears that the mean temperature of the island 49°. 99, 

 exceeding that of Edinburgh by about 2°. 2, and inferior to 

 that of London by about I'^. 



The second table contains the elevation of 78 different 

 spots in the island, deduced from barometrical observations. 

 Of these there are twenty-one the height of which is be- 

 tween 1000 and £000 feet above the level of the sea. 

 June 18. 



Sir Henry Englefield, Bart., Vice President, in the chair. 



The Rev. Edward Hony, Fellow of ExeterCcllege, Oxford; 



The Rev. George Barnes, Fellow of Exeter College,Oxford; 



John Hanson, Esq. of Bloomsbury Square; 



John Forster Barham, Esq. M.P. of Oueea Anne Streeti 



Thomas Bigges. Esq. of Brompton ; 



Samuel Turner, Esq. of Nottingham Place ; 

 were severally elected members of the Society. 



