Among the earthy minerals, we may particularize, as unusually fine, the specimens of _Calcedony_, _Sodalite_, _Haüyne_, _Petalite_, _Colophonite_, _Vesuvian_, &c. In the metallic department, we may notice the _Carbonate of Lead_, _Specular Iron_, _Arseniate of Iron_, _the Oxide, Carbonate, Arseniate and Phosphate of Copper_, _Native Gold_ from the Tin-stream-works of Cornwall, _Arsenical Pyrites_, _Uranite_, _Uran-ochre_, _Native Nickel_, &c. Here also may be seen a mineral, hitherto almost unknown,--_a Sub-carburet of Iron_; it was analysed by that late eminent chemist, the _Rev. W. Gregor_, who received it from the hands of the _Rev. J. Rogers_ of Mawnan. It was found in a vein about half an inch wide, intersecting either hard _Clay-slate_ or _Graywacké_. Among the saline minerals in the cabinet are _Glauberite_, and _Sassoline_ or native Boracic acid. A Laboratory, containing the necessary apparatus for analytical operations, is attached to the establishment. In conclusion, we will venture to affirm, that the advantages and enjoyments which such societies are calculated to afford are not only obtained without any expense to the country in which they are encouraged, but that they actually repay _in wealth_ and _emolument_ much more than they require for their support. Had the Cornish Society been earlier called into existence, we should never have heard of the most valuable productions of our country having been thrown into the sea, nor of their having been used as materials for the repair of roads, or the construction of cottages: on the contrary, how many thousand tons of ore might have been gained?--how many years of unprofitable but expensive labour saved? and how many individual adventurers preserved from disappointment, or rescued from ruin? Amongst the efforts made by this Society to improve the theory and art of mining, through the application of science, not the least interesting and praiseworthy is that which relates to the prevention of accidental explosion in the methods of blasting rocks with gunpowder, by the introduction of "_Safety Instruments_."