Extracts firm the Minute Book of the Geological Society. 



1811, November 1. 



An extract of a letter from Dr. Murray, of Harrogate, to Mr. 

 Sowerby, was read, mentioning that sulphate of strontian had been 

 found in limestone on the banks of the Nidd, near Knaresborough. 



1812, March 6. 



A notice by Arthur Aikin, Esq. was read, on a green waxy sub- 

 stance found in the alluvial soil near Stockport, in Cheshire. 



In 1811 a specimen from the abovementioned place was commu- 

 nicated to the Society by Dr. Henry. On a chemical examination 

 Mr. Pepys found it to be a combination of resin and oil mixed with 

 a quantity of brown quartzy sand. Its colour was bluish green, 

 and was at first supposed to be occasioned by copper, but no me- 

 tallic matter except iron was discovered in it. From its compo- 

 sition, and the small depth at which it was found, it was not sup- 

 posed to be a natural product, but Mr. Aikin is inclined to doubt 

 this conclusion, having met with, in the Dictionnaire d'Histoire 

 Naturelle, under the article Sabliere, an account by M. Patrin, 

 of the discovery of a similar substance at the foot of the hill of 

 Menil Montant, near Paris. It there occurs in sand, accompanied 

 by fresh water shells. 



1812, June 19. 



A notice by C. Mackintosh, Esq. on the aluminous strata at 

 Gampsie was read. 



The coal formation which the Scottish aluminous strata accom- 

 pany, may perhaps be traced and identi ed in four distinct points 

 of this particular district of Scotland, namely, Cainpsie in Stirling- 

 shire, Kilpatrick in Dumbartonshire, and Hurlet and Houston, in 



Vol. iv. 3 l 



