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On the Theory of Compound Colours, and the Relations of the 

 Colours of the Spectrum. By Professor J. Clerk Maxwell 404 



On the Insulating Properties of Gutta Percha. By F. Jenkin, Esq. 409 

 On Scalar and Clinant Algebraical Coordinate Geometry, introducing 



F.C.P.S 415 



On the Volumetric Eelations of Ozone and the Action of the Elec- 

 trical Discharge on Oxygen and other Gases. By Thomas An- 

 drews, M.D., F.R.S., and P. G. Tait, Esq., M.A 427 



On the Equation of Differences for an Equation of any Order, and in 

 particular for the Equations of the Orders Two, Three, Four, and 

 Five. By Arthur Cayley, Esq., F.R.S. 428 



On the Theory of Elliptic Motion. By Arthur Cayley, Esq., F.R.S. 430 



On the Application of Electrical Discharges from the Induction Coil 

 to the purposes of Illumination. By J. P. Gassiot, Esq., F.R.S. 432 



The Croonian Lecture. On the Arrangement of the Muscular Fibres 

 of the Ventricular portion of the Heart of the Mammal. By 

 James Pettigrew, Esq 433 



Note on Regelation. By Michael Faraday, D.C.L., F.R.S. &c 440 



Notes on the apparent Universality of a Principle analogous to Re- 

 gelation, on the Physical Nature of Glass, &c. By Edward W. 

 Brayley, Esq., F.R.S. &c 450 



On the Effect of the presence of Metals and Metalloids upon the 

 Electric Conductivity of Pure Copper. By A. Matthiessen, Esq., 

 and M. Holzmann, Esq 460 



On the relations between the Elastic Force of Aqueous Vapour at 

 ordinary temperatures and its Motive Force in producing Currents 

 of Air in Vertical Tubes. By W. D. Chowne, M.D., F.R.C.P. . . 461 



On the Relation between Boiling-point and Composition in Organic 

 Compounds. By Hermann Kopp, Esq 463 



Account of a remarkable Ice Shower. By Captain Blakiston, R. A. 468 



The Bakerian Lecture. On the Density of Steam and the Law of 

 Expansion of Superheated Steam. By William Fairbairn, Esq., 

 F.R.S., and Thomas Tate, Esq 469 



On a new Method of Approximation applicable to Elliptic and Ultra- 

 elliptic Functions. By C. W. Merrifield, Esq 474 



On the Lunar-diurnal Variation of Magnetic Declination at the Mag- 

 netic Equator. By John Allan Broun, Esq., F.'R.S 475 



Postscript to a Paper " On Compound Colours, and on the Relations 

 of the Colours of the Spectrum." By J. Clerk Maxwell, Esq 484 



Report to the Royal Society of the Expedition into the Kingdom of 

 Naples to investigate the circumstances of the Earthquake of the 

 16th December 1857. By Robert Mallet, Esq., C.E., F.R.S 486 



Annual General Meeting for the Election of Fellows 494 



