SCIENTIFIC NEWS, 
213 
•f decayed slate, and a little iron pyrites. The colour of the 
sandstone is red or greyish white j it is more or less slaty, ac- 
cording to the proportion of mica that it contains ; it lies uncon- 
formably ovej: the Gran-wakke, and dips N. W. at an angle 
varying from 35° to l5 a . 
On the sea shore, and on the slopes of several of the moun- 
tains, are loose blocks, in great abundance, of granite, of mica 
slate, and of porphyry. 
The only veins in the island are at Laxey, at Foxdale, and 
at Brada-head. At present, however, they are all abandoned. 
The ore is galina, mixed with pyrites, and with the carbonates 
of lead and of copper. The rock through which the veins 
run is Grey-wakke ; 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, ascertained 
during the month of June, 181 1 . From this it appears, that 
the mean temperature of the island is 49 0 gg', exceeding that 
of Edinburgh by about 2° 2', and nferior to that of London by 
about lo. 
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 between 
1000 and 2000 feet above the level of the sea. 
June 18 , 1813. 
Sir Henry Englefield, Bart. Vice Pres, in the chair. 
The Rev. Edward Honey, fellow of Exeter College, Oxford; 
The Rev. George Barnes, Fellow of Exeter College, Oxford, 
John Hanson, Esq of Bloomsbury Square, 
John Forster Barham, Esq. M. P. of Queen Anne Street, 
Thomas Bigge, Esq. of Brompton, 
Samuel Turner, Esq. of Nottingham Plade, 
were severally elected members of the Society. 
A letter from James Curry, M. D. M. G. S. was read. 
In this letter Dr. C describes a remarkably large specimen’of 
nodular agate (exhibited before the Society) which he conceives 
to point out a natural connexion between agate and the 
Plasma of the ancients. 
The 
