VIU CONTENTS. 



Page 

 Professor W. B. Rogers's Accoxint of Apparatus and Processes for the Che- 

 mical and Photometrical Testing of Illuminating Gas 39 



on an Invention by Mr. Cornelius, of Philadelphia, 



for Lighting Gas by Electricity 40 



Professor Roscoe's Contributions towards the Foundation of Quantitative 

 Photography 40 



Description of a Chemical Photometer for Meteorological 



Observation 41 



Note on the Existence of Lithium, Strontium, and Copper 



in the Bath Waters 41 



Mr. AV. L. Scott on some probable New Sources of Thallimn 41 



Mr. P. Spence on Copper-smelting 41 



Dr. Sullivan on the Precipitation of Aluminous Silicates from Solution .... 42 



Professor Tennant on the Colouring of Agates 42 



Mr. J. Alfbed Wanklyn on the Rational Fonmda of Rosaniline 42 



's Note on the Probable Constitution of Kolbe and 



Schmitt's Coloiu-ing Matter obtained by acting upon Carbolic Acid with 

 Oxalic and Sulphuric Acids 44 



on a curious Example of Etherification 44 



Dr. Williamson on Isomorphism 45 



GEOLOGY. 



Address by John Phillips, M.A., LL.D., F.R.S., F.G.S., President of the 

 Section 45 



Mr. W. Hellieb Baily on some New Points in the Structure of Palaechinus 49 



— on the Occurrence of Fish Remains in the Old Red 



Sandstone at Portishead, near Bristol 49 



Mr. A. Bassett on the South Wales Mineral Basin 50 



Mr. Henby B. Bbady on the Foraminifera of the Middle and Upper Lias of 

 Somersetshire 50 



Mr. Henby W. Beistow on the Rhaetic (or Penarth) Beds of the Neighbour- 

 hood of Biistol and the South-West of England. (Communicated by Sir 

 RoDEBicK L MuBcmsoN, K.C.B., D.C.L., LL.D., F.R.S.) 50 



Rev. P. B. Bbodie's Remarks on two outliers of Lias in South Warwickshire, 

 and on the presence of the Rhtetic Bone-bed at Knowle, its furthest north- 

 em extension hitherto recognized in that County 62 



Rev. C. F. Bboavne on the Formation and Condition of the Ice in certain Ice 

 Caves of the Jura, Vosgian Jura, Dauphine, and Savoy 52 



Dr. Philip P. Cabpenteb on the Connexion between the Crag Formations 

 and the recent North Pacific Faunas 52 



Mr. Handel Cossham on the Geological Formation of the District aroimd 

 Kingswood Hill, with especial reference to the supposed development of 

 Millstone Grit in that neighbourhood 52 



Dr. Daubeny on the Cause of the Extrication of Carbonic Acid from the In- 

 terior of the Earth, and on its Chemical Action upon the Constituents of 

 Felspathic Rocks 52 



Mr. W. Boyd Da'wtcins on the Newer Pliocene Fauna of the Caverns and 

 River-Deposits of Somersetshire 53 



