CONTENTS. V 



Page 

 Mr. L. L. B. Ibbetson on a Method of Electrotype, by which the Deposition 



on Minute Objects is easily accomplished 39 



Mr. Thomas Exley on the Alternate Spheres of Attraction and Repulsion, 



noticed by Newton, Boscovich and others ; and on Chemical Affinity 39 



Sir G. GiBBES on the Constitution of Matter 41 



Mr. W. Lucas on the Alteration that takes place in Iron by being exposed to 



long-continued Vibration 41 



GEOLOGY AND PHYSICAL GEOGRAPHY. 



Mr. G. A. Mantell on a newly-discovered Species of Unio, from the Wealden 

 Strata of the Isleof Wight 42 



Professor Ansted on Mining Records, and the Means by which their Preserva- 

 tion may be best ensured 42 



Professor E. Forbes and Mr. L. L. Boscawen Ibbetson on the Tertiary and 

 Cretaceous Formations of the Isle of Wight 43 



The Very Rev. the Dean of York's Critical Remarks on certain Passages in 

 Dr. Buckland's Bridgewater Treatise , 44 



Mr. G. W. Featherstonhaugh on the Excavation of the Rocky Channels of 

 Rivers by the Recession of their Cataracts 45 



Mr. Elias Hall on the Midland Coal Formations of England 46 



Sir H. T. De la Beche's Account of that Portion of the Ordnance Geological 

 Map of England now completely coloured, and Notes concerning a Section 

 through the Silurian Rocks in the vicinity of Builth 46 



Mr. Richard Griffith on certain Silurian Districts of Ireland 46 



Mr. Edward Charlesworth's Notice of the Discovery of a large Specimen 

 of Plesiosaurus found at Kettleness, on the Yorkshire Coast 49 



On the Discovery, by Mr. Searles Wood, of an Alligator in the Freshwater Cliff 

 at Hordwell, associated with extinct Mammalia 50 



Professor Loven on the Bathymetrical Distribution of Submarine Life on the 

 Northern Shores of Scandinavia 50 



Mr. H. E. Strickland on an Anomalous Structure in the Paddle of a Species 

 of Ichthyosaurus 51 



Queries and Statements concerning a Nail found imbedded in a Block of Sand- 

 stone obtained from Kingoodie (Mylnfield) Quarry, North Britain 51 



Mr. J. RooKE on the Relative Age and True Position of the Millstone Grit and 

 Shale, in reference to the Carboniferous System of Stratified Rocks in the 

 British Pennine Chain of Hills 51 



Mr. John Alsop on the Toadstones of Derbyshire 51 



Mr. S. Eddy's Account of the Grassington Lead Mines, illustrating a Model of 

 the Mine 52 



Mr. R. I. Murchison on the Palaeozoic Rocks of Scandinavia and Russia, par- 



; ticularly as to the Lower Silurian Rocks which form their true Base 53 



A Geological Map of the British Isles and part of France was exhibited by Mr. 

 J. Knipe 55 



Rev. David Williams on the Exeter Amygdaloid 55 



Mr. Arthur Dean's Notice respecting the Discovery of Gold Ores in Merioneth- 

 shire, North Wales 56 



■ Observations on the Stratification of Igneous and Sedimen- 

 tary Rocks of the Lower Silurian Formation in North Wales 56 



Mr. Edmund Batten on the Explanation of certain Geological Phsenomena by 

 the Agency of Glaciers 57 



Mr. Thomas Oldham on the Occurrence of Marine Shells in the Gravels of 

 Ireland 57 



Captain Maconochie on the Physical Character and Geology of Norfolk Island 57 



Signor Gaetano Moro on the Communication between the Atlantic and Pacific 

 Oceans, through the Isthmus of Tehuantepec 58 



Mr, Richard King on the Fish River of the North Polar Sea 58 



