CONTENTS. 
Dr. Scorrern on the combined Use of the Basic Acetates of Lead and Sulphu- 
’ rous Acid in the Colonial Manufacture and the Refining of Sugar ...... Stédeee 
Dr. A. Vaucxer on the Composition of the Ash of Armeria maritima, grown 
_ in different Localities, and Remarks on the Geographical Distribution of that 
Plant, and the Presence of Fluorine in Plants......... Poder eceketcwr =; mae aA 4 
Mr. W. H. Watewn on a Form of Galvanic Battery.........1.ssssseeesesceeeeeceees 
Mr. W. Syxes Warp on Motions exhibited by Metals under the Influence of 
Magnetic and Diamagnetic Forces......ssscsssssesserecesseeterserssraceeseesesaaeaes 
on a Theory of Induced Electric Currents, suggested by 


" Diamagnetic PHENOMENA 4.0. eeccestesesscceccccastancsceusess Bececnbauiees SppaciEgaood 
on the comparative Cost of working various Voltaic 
Arrangements ....s...-..seesceeseecsensseseeeeesaeccneanenensscessceseueeeeeceesees Soadodhic 
Mr. W. West on the Presence of Nitrogen in Lenmdeval Waters.......008 Seeeie sate 
Mr. Grorcer WILson on the Presence of Fluorine in the Waters of the Firth 
’ of Forth, the Firth of Clyde, and the German Ocean........s.ssseseessseeesenees 
Mr. F. C. Wrieutson’s Analytical Investigations of Cast Iron .........sesesceee 
GEOLOGY AND PHYSICAL GEOGRAPHY. 
Mr. Rosezrt A. C. Austen’s Notes on the Geology of the Channel Islands ... 
Mr. E. CuarLeswortu on some New Species of Testacea from the Hampshire 
Tertiary Beds .........0++00 aida tan Mp neeap cme nceasesns oecisn snes a sia Winiea scp pees enis Seis 
Mr. Joun Hoge on the Geography and Geology of the Peninsula of Mount 
Sinai and the adjacent Countries ......ccscccseccsssssccerscecccceccccssoccscscencscees 
Mr. J. Beers Juxes on the Relations between the New Red Sandcene the 
Coal-measures, and the Silurian Rocks of the South Staffordshire Coal-field. 
Mr. Isaac Lza on Traces of a Fossil Reptile (Sauwropus primevus) found in the 
Old Red Sandstone (communicated by Dr. Buckland) ....,..+0...0sse0 Ravers 
Dr. G. Lioyp on a New Species of Labyrinthodon from the New Red Sand- 
* stone of Warwickshire ...... Hi CaS PR c pec SnaA aes Ban anekaaiegeacaas Siena bir ns ania Seal onis 
Mr. Jonn Morarts’s Note on the Genus Siphonotreta, with a Description of a 
New Species (communicated by Sir R. I. Murchison) ...... des aga AgseasRee ea 
M. Barranpe’s Discovery of the Metamorphosis of certain Trilobites (commu- 
nicated by Sir R. I. Murchison) ........ Pear h sesso saay cctsatene sea socencsssincrns senees 
“Jl R. I. Murcutson on the Distribution of Gold Ore in the Crust and on the 
Surface of the Earth ............ Adder eat ascnsiaes vegdbedacustus ss Sesinensass naan toeeee 
Mr. C. W. Peacu on the Fossil Geology of Contwall maeenea mee eae ete Ranueeen 
Mr. Joun Pxant’s Notice of the Discovery of Beds of Keuper Sandstone con- 
taining Zoophytes in the Vicinity of Leicester...... Anne gceece teecsccccecccncscnenen 
Mr. Lovexu Reeve on the Discovery of a Living Representative of a ai 
~ Group of Fossil Volutes occurring in the Tertiary Rocks ............0000+ wnaeheine 
Mr. Wittram Sanpers on the ee of the Saurians named Thecodontosaurus 
BAN PALCOSAUrUS....0.ccrorersssscevcecacaceccscsccctcccccccoscevsccsosees SGnrigedocuenacche 
THE DEan oF Miatenttaueate on the Cause of the general Presence of Phos- 
' phorus in Strata and in all fertile Soils; also on Pseudo-Coprolites, and the 
Conversion of the Contents of Sewers and Cesspools into Manure ............ 
_ The Rev. D. Wittrams on an original broad Sheet of Granite, interstratified 
among Slates with Grit Beds, between Falmouth and Truro in Cornwall .... 
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