VI CONTENTS OF VOL. XI. — FOURTH SERIES. 



Page 

 Preparation of Peroxide of Lead by means of Ferridcyanide of 



Potassium, by Dr. A. Overbeck 407 



Meteorological Observations for March 1856 407 



Table , . . 408 



NUMBER LXXIV.— JUNE. 



Mr. A. Dick's Contributions to the Metallurgy of Copper .... 409 



Mr. A. Cayley on the Theory of Elliptic Motion 425 



The Rev. S. Haughton on the Solar and Lunar Diurnal Tides 



of the Coasts of Ireland {concluded) 428 



Prof. W. Thomson on the Dynamical Theory of Heat. — Part VL 



Thermo-electric Currents (concluded) 433 



Prof. W. Thomson on the Discovery of the true form of Carnot's 



Function 447 



Mr. W. Swan on a nevsr Method of observing the Spectra of 



Stars 448 



Prof. J. J. Sylvester on Projectiles 450 



Dr. Atkinson's Chemical Notices from Foreign Journals 453 



Prof. Matteucci's Experiments in Electro-physiology 461 



Prof. J. J. Sylvester on an Intuitive Proof of the Existence of 



Twenty-seven Conies of closest Contact with a Curve of the 



Third Degree , 463 



Proceedings of the Royal Society 464 



Geological Society 477 



Royal Institution 482 



On some of the principal causes of Atmospheric Electricity, by 



M. Becquerel 484 



On the Boronatrocalcite of South America, by C. Rammelsberg. 486 



On a Coprolitic Deposit in Bohemia, by Prof. Reuss 486 



Meteorological Observations for Aj^ril 1856 487 



Table 488 



NUMBER LXXV.— SUPPLEMENT TO VOL. XI. 



Prof. Helmholtz on the Interaction of Natural Forces 489 



Dr. Barker on the relative value of the Ozonometers of Drs. 

 Schonbein and Moftat, based upon daily observations for 



eighteen months at Bedford 518 



Dr. Riess on the Law of Electric Discharge 524 



Mr. A. H. Church on the Production of Formic ^ther 527 



M. E. Breunlin on the Constitution of Green and Blue Ultra- 

 marine 528 



The Rev. J. A. Galbraith on a general Construction for finding 



the maximum Range of Projectiles in vacuo 538 



Proceedings of the Royal Society 540 



Geological Society 551 



On some new Colouring Matters, by Arthur H. Church and 



William H. Perkin 554 



Index 555 



