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Taylor, Mr. Conybeare, and Mr. Sedgwick. Mr. Fox has for some 

 time very succesfully turned his attention to the formation of 

 mineral lodes, or veins ; and to the principle of electro-magnetism, 

 as applied to these formations. It had been observed by Mr. Fox, 

 and by others acquainted with the peculiar structure of the Cornish 

 metalliferous deposits, that the same lode would sometimes contain 

 copper pyrites ; and within a short distance, and merely separated 

 by the common argillaceous substances, sulphate of copper, or some 

 other modification of the same material. Whenever this occurred, 

 the lode was generally found to be saturated with water, containing 

 various salts ; a circumstance that seems to influence, in some de- 

 gree, the change in the mineral deposit. Mr. Fox, applying the ex- 

 ercise of his strong and highly cultivated mind to these phenomena, 

 immediately conceived the notion that electro-magnetism was the 

 prime agent in the production of this extraordinary change. To 

 prove this, he procured an earthen pan, which he divided into two 

 compartments, by inserting in the centre a barrier of clay saturated 

 with dilute sulphuric acid, and jammed down closely. In the one 

 compartment he placed water, charged with the sulphate of copper ; 

 and in the other, dilute sulphuric acid. In the sulphuric acid he 

 placed plates of zinc, connected by a rod and wire with a piece of 

 copper pyrites, suspended in the water contained in the other com- 

 partment. In a short time electro-magnetic action commenced. 

 The sulphur passed from the water through the barrier of clay to 

 the zinc, and there not being sufficient sulphur in that water to form 

 by this union sulphate of zinc, the copper pyrites was deprived of a 

 portion of its sulphur, and changed to common gray copper ! Mr. 

 Fox thinks he shall be enabled to complete this experiment without 

 the dilute sulphuric acid, and merely by water. 



At the evening meeting, Professor Phillips gave an account of 

 the distribution over the northern parts of England of Blocks or 

 Boulders, which excited some interesting remarks from Professors 

 Sedgwick, Buckland, and Murchison. 



Wednesday. — Mr. Stutchbury read a paper on some newly-dis- 

 covered Saurian Remains, from the Magnesian Conglomerate of 

 Durdham Down. This communication chiefly related to the speci- 

 mens exhibited to the meeting, and contained a number of minute 

 anatomical details, which testified the industry of Dr. Riley and 

 Mr. Stutchbury, who had examined the specimens. These highly 

 interesting organic remains were found in the magnesian conglo- 

 merate that rests upon the limestone, and they must have been de- 

 posited upon the spot where they were found without violent ac- 

 tion, as they bear no marks of attrition ; they are often injected 

 with the rocky paste, which has been originally of a viscid charac- 

 ter, from its containing blocks of limestone suspended, even near to 

 the surface, and bones have been found near the bottom. The 

 most interesting fact mentioned was the peculiar structure of the 

 vertebrae of the newly-discovered saurians, which, from their deeply 

 concave structure, presented a remarkable contrast to those of the 



