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Notes of a Comparison of the Granites of Cornwall and Devonshire with 

 those of Leinster and Mourne. Bv the Rev. Samuel Haughton, M.D., 

 D.C.L., F.R.S., Fellow of Trinity College, Dublin , 209 



On the Relation of Hydrogen to Palladium. By Thomas Graham, F.R.S., 

 Master of the Mint". 212 



A Memoir on the Theory of Reciprocal Surfaces. By Professor Cayley, 

 F.R.S 220 



A Memoir on Cube Surfaces. By Professor Cay ley, F.R.S 221 



On the Blue Colour of the Sky, the Polarization of Skylight, and' on the 

 Polarization of Light by Cloudy matter generally. By John Tyndall, 



On the Thermal Resistance of Liquids. By Frederick Guthrie, F.C.S. . . 284 



Results of a Preliminary Comparison of certain Curves of the Kew and 

 Stonvhurst Declination Magnetographs. By the Rev. W. Sidgreaves 

 and Balfour Stewart, LL.D., F.R.S * 236 



On the reappearance of some periods of Declination Disturbance at Lisbon 

 during two, three, or several days. By Senhor Capello, of the Lisbon 

 Observatory 238 



On the Action of Solid Nuclei in Liberating Vapour from Boiling Liquids. 

 By Charles Tomlinson, F.R.S 240 



Researches conducted for the Medical Department of the Privy Council 

 at the Pathological Laboratory of St. Thomas's Hospital. By J. L. 

 W. Thudichum, M.D 253 



On Hydrofluoric Acid. By G. Gore, F.R.S 256 



On a momentary Molecular Change inL-on Wire. By G. Gore, F.R.S. . . 260 



On the Devolopment of Electric Currents by Magnetism and Heat. By 

 G. Gore, F.R.S 265 



On Fossil Teeth of Equines from Central and South America, referable to 

 Equus conversidens, Equus tau, and Equus arcidens. By Professor Owen, 

 F.R.S 267 



Compounds Isomeric with the Sulphocyanic Ethers. — III. Transformations 

 of Ethvlic Mustard-oil and Sulphocyanide of Ethyl. By A. W. Hof- 

 mann, Ph.D., M.D., LL.D., F.R.S 269 



On the Solar Protuberances. By M. Janssen. In a Letter to Warren De 



On the Structure and Development of the Skull of the Common Fowl 

 (Gallus domesticus). By W. Kitchen Parker, F.R.S 277 



Determinations of the Dip at some of the principal Observatories in Europe 

 by the use of an Instrument borrowed from the Kew Observatory. By 

 Lieut. Elagin, Imperial Russian Navy 280 



