vi 



Page 



Contributions towards determining the Weight of the Brain in the different 

 Races of Man. By Joseph Barnard Davis, M,D 236 



Description of a Hand Spectrum-Telescope. By William Huggins, F.R.S. 241 



Remarks upon Archceopteryx Uthographica. By Prof. T. H. Huxley, LL.D., 

 F.R.S 243 



Account of Experiments on Torsion and Flexure for the Determination of 

 Rigidities. By J oseph D. Everett, D.O.L., Professor of Natm'al Philo- 

 sophy in Queen's College, Belfast, F.R.S 248 



Comparison of Magnetic Disturbances recorded by the Self-registering Mag- 

 netometers at the Royal Observatory, Greenwich, with Mag-netic Dis- 

 turbances deduced from the corresponding Terrestrial Galvanic Currents 

 recorded by the Self-registering Galvanometers of the Royal Observatory. 

 By George Biddell Airy, Astronomer Royal, F.R.S 249 



On the Mysteries of Numbers alluded to by Fermat. — Second Communica- 

 tion. By the Right Hon. Sir Frederick Pollock, Baii;., F.R.S 251 



Compounds Isomeric with the Sulphocyanic Ethers. — I. On the Mustard-oil 

 of the Ethyl-series. By A. W. Hofmann, LL.D., F.R.S 254 



Sur rOrigine de I'Electrotone des Nerfs. Par M. Ch. Matteucci 258 



On the Resistance of the Air to the Motion of Elongated Projectiles having 

 variously formed Heads. By the Rev. F. Bashforth, B.D., Professor of Ap- 

 plied Mathematics to the Advanced Class of Artillery OflScers, Woolwich. 261 



On the Resistance of the Air to Rifled Projectiles. By J. A. Longridge, 

 C.E 263 



On the Theory of Probability, applied to Random Straight Lines. By M. 

 W. Crofton, B.A., of the Royal Military Academy, Woolwich, late Pro- 

 fessor of Natural Philosophy in the Queen's University, Ireland 266 



On Governors. By J. Clerk Maxwell, M.A., F.R.SS.L. & E 270 



Proceedings of the Council of the Royal Society with reference to the 

 undertaking of certain Physical Observations in India 283 



Notes on the Chemical Geology of the Gold-fields of California. By J. 

 Arthui' Phillips 294 



Third Supplementary Paper on the Calculation of the Numerical Value of 

 Euler's Constant. By William Shanks 299 



Transformation of the Aromatic Monamines into Acids richer in Carbon. — 

 n. On Menaphthoxylic Acid, the Naphthaline-term corresponding to 

 Benzoic Acid. By A. W. Hofmann, LL.D., F.R.S 300 



On the Relation of Form and Dimensions to Weight of Material in the Con- 

 struction of Iron-clad Ships. By E. J. Reed, Chief Constructor of the 

 Navy 306 



On the Amoimt and Changes of the Polar Mag-netism at certain positions 

 in Her Majesty's Iron-built and Aimour-plated Ship 'Northumberland.' 

 By Frederick John Evans, F.R.S., Staff- Captain R.N., in charge of the 

 Admiralty Magnetic Department 311 



