PROCEEDINGS OF THE MEETING. XXXIII 



A notice of some experiments relative to Isomorphism, by 

 Dr. Turner and Professor Miller, was read. 



Dr. Daubeny made a communication on the Gases given off 

 from the surfaces of the water in certain thermal springs. 



The Rev. W. V. Harcourt exhibited specimens of Metal taken 

 out of the crevices at the bottom of a mould in which a large 

 bronze figure had been cast by Mr. Chantrey ; together with 

 fragments of the Bronze employed in the casting, from which 

 the former specimens differed considerably in colour, frangi- 

 bility, &c. 



Mr. Lowe gave an account of various chemical products 

 found in the retorts and flues of Gas Works. 



Mr. Pearsall made a communication on the bleaching powers 

 of Oxygen. 



Mr. J. Taylor described the character of the Ecton Mine, 

 and the occurrence of the copper ore in connected cavities 

 which had been explored to a depth of 225 fathoms without 

 reaching the termination of them. 



Dr. Buckland described the manner in which fibrous Limer 

 stone occurs in the Isle of Purbeck and other situations. 



Mr. Murchison stated, and illustrated by Maps and Sections, 

 the principal results of his inquiries into the sedimentary de- 

 posits which occupy the western parts of Shropshire and Here- 

 fordshire, and are prolonged in a S.W. direction through the 

 counties of Radnor, Brecknock, and Caermarthen, and the in- 

 trusive igneous rocks which occur in certain parts of the di- 

 strict. He mentioned the occurrence of freshwater Limestone 

 in a detached Coal-field of Shropshire. 



Professor Sedgwick described the leading features in the 

 Geology of North Wales, the lines of elevation, the relation of 

 the trap rocks to the slate system, the cleavage of the slate ; 

 pointed out the relations of this tract to that examined by Mr. 

 Murchison ; and drew a general parallel between the slate 

 formations of Wales and Cumberland. 



Mr. J. Taylor having read to the Section the concluding 

 part of his Report on Veins, in the discussion which followed, 

 M. Dufrenoy entered into a consideration of some phaenomenaof 

 the igneous rocks of Britanny and Central France, viewed with 

 reference to the connexion between them and the metalliferous 

 veins of those districts, and remarked on the occurrence in 

 Central France of mineral veins, only in the narrow zone at the 

 junction of the unstratified and stratified rocks. He also made 

 some remarks on the association of dolomite and gypsum, with 

 the igneous rocks of the Alps and the Pyrenees. 



Professor Sedgwick gave a general account of the Red Sand- 

 stones connected with the Coal-measvires of Scotland, and the 



