CONTENTS OF VOL. XVIII. — FOURTH SERIES. Vll 



Page 

 Mr. G. B. Buckton on the Organo-metallic Radicals Mer- 

 curic, Stannic, and Plumbic Ethyles 382 



Dr. RadclifFe on Muscular Action from an electrical point 



of view 386 



Mr. J. A. Wanklyn on the Action of Carbonic Oxide on 



Sodium-alcohol 391 



Prof. F. W. Newman on the Higher Theory of Elliptic 



Integrals 394 



On the Production of Azurite, by H. Debray 397 



Note on some new Experiments in Electro-physiology, by C. 



Matteucci ,' . . . 398 



On the Formulae of Kapnicite and Wavellite, by G. Stadeler. . 400 



NUMBER CXXII.— DECEMBER. 



F. Dellmann on Atmospheric Electricity 401 



The Rev. S. Haughton on the Thickness of the Earth's Crust. . 420 

 Prof. Stokes on the bearing of the Phsenoraena of Diffraction 

 on the Direction of the Vibrations of Polarized Light, with 



Remarks on the Paper of Prof. F. Eisenlohr 426 



Mr. C. M. Willich on the Angle of Dock Gates and the Bee's 



Cell 427 



Dr. E. Smith on the immediate Source of the Carbon exhaled 



by the Lungs 429 



Mr. A. Cayley on a Proof of the Theorem that every Algebraic 



Equation has a Root 43g 



Mr. A. Cayley on Cones of the Third Order 439 



Prof. Challis on the Force of Gravity 442 



Dr. Atkinson's Chemical Notices from Foreign Journals 451 



Notices respecting New Books : — Mr. R, Burchett's Practical 



Geometry 459 



Proceedings of the Royal Society : — 



Mr.C. W. Merrifield on theComparison of Hyperbolic Arcs. 461 

 Dr. Debus on the Oxidation of Glycol, and on some Salts 



of Glyoxylic Acid 463 



Dr. Fair on the Construction of Life-Tables 467 



Mr. A. Cayley on the Double Tangent of a Plane Curve . 471 



Dr. Simpson on the Action of Acids on Glycol 471 



Proceedings of the Geological Society : — 



The Rev. W. S. Symonds on the Passage-beds -from the 

 Upper Silurian Rocks into the Lower Old Red Sand- 

 stone, at Ledburj% Herefordshire 474 



Mr. F. Bcrnalon the so-called Mud Volcanos of Turbaco. 475 

 Mr. H. Weekes on the Coal Formation at Auckland, New 



Zealand 475 



Mr. H. Bauerman on the Geology of the South-east part 

 of Vancouver's Island 475 



