CONTENTS OF VOL. XI. — FOURTH SERIES. V 



NUMBER LXXII.— APRIL. 



Page 



M. F. Reich on Diamaguetic Action 249 



Mr. H. M.Witt's Chemical Examination of certain Lakes and 



Springs on the Turko-Persian frontier near Mount Ararat . 257 

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



of the Coasts of Ireland (continued) 262 



Dr. Heddle on the Galactite of Haidinger, with Analyses of 



Scotch Natrolites 272 



Mr. A. Cayley on the Theory of Logarithms 275 



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



Thermo-electric Currents (continued) 281 



Mr. T. Tate on a New Double-acting Air-pump with a single 



Cylinder 297 



Notices respecting New Books : — Mr. H. Wedgwood on the 



Geometry of the Three First Books of Euclid, by Direct Proof, 



from Definitions alone, with an Introduction on the Principles 



of the Science 300 



Proceedings of the Royal Society 301 



Cambridge Philosophical Society 307 



Geological Society 311 



Royal Institution 315 



Contribution to the Knowledge of Fluorescence, by G. Osann. . 324 

 Examination of the Green Matter of Infusoria, by the Prince of 



Salm-Horstmar 326 



Meteorological Observations for February 1856 327 



Table 328 



NUMBER LXXIII.— MAY. 



Prof. Tyndall on a peculiar case of Colour Blindness 329 



Messrs. J. Spiller and W. Crookes's Researches on the Methods 



of preserving the Sensitiveness of Collodion Plates 334 



Sir W. Snow Harris on a General Law of Electrical Discharge. 



(With a Plate.) 339 



Mr. T. Tate on certain Modifications of the Form of the new 



Double-acting Air-pump with a Single Cylinder 360 



Mr. B. Williamson on the Solution of certain Differential Equa- 

 tions 364 



Dr. Atkinson's Chemical Notices from Foreign Journals 372 



Mr. A. Cayley on a Result of Elimination 378 



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



'I'hermo-electric Currents (continued) 379 



M. R. Clausius on the Discovery of the true form of Carnot's 



Function 388 



Proceedings of the Royal Society 390 



Geological Society 393 



Cambridge Philosophical Society 398 



On Voiknerite or Hydrotalkite, and the so-called Steatite of 



Snarnm, by C. RammeLsberg 405 



