CONTENTS OF VOL. XXVII. FOURTH SERIES. Vll 



Page 

 On the Passage of Radiant Heat through Rock-salt, either 

 Polished, Rough, or covered with Lampblack, and on the Dif- 

 fusion of Calorific Rays, by H. Knoblauch 396 



On the Variation of Magnetic Force with the Temperature, by 



M. Mauritius 398 



On the Artificial Production of Asterism, by C. A. Gruel, of 

 Berlin ...... 400 



NUMBER CLXXXIV.— JUNE. 



Count Paul de Saint-Robert on the Measurement of Heights by 

 the Barometer, and on Atmospheric Refraction, having regard 

 to the Constitution of the Atmosphere, resulting from Mr. 



James Glaisher's Observations 401 



Mr. C. Tomlinson on a new Variety of the Cohesion-Figures of 



Liquids. (With a Plate.) 425 



M. G. Quincke on the Refractive Index of the Metals 432 



Mr. A. Cayley on the Nodal Curve of the Developable derived 



from the Quartic Equation (a, b, c, d, e^J, 1) 4 = 437 



Father A. Secchi on Kirchhoff's Theory of Solar Spots 440 



Mr. G. Gore on the Electrical Relations of Metals &c. in Fused 



Substances „ 446 



Prof. Challis's Researches in Hydrodynamics, with reference 



to a Theory of the Dispersion of Light 452 



Proceedings of the Royal Society :— 



Drs. A. Matthiessen andC. Vogt on the Influence of Tem- 

 perature on the Electric Conducting-Power of Alloys . . 467 

 Sir B. C. Brodie on the Peroxides of the Radicals of the 



Organic Acids 469 



Mr. B. Stewart on the Magnetic Disturbance which took 



place on the 14th of December 1862 471 



Mr. B. Stewart on the Change in the Elastic Force of a 

 Constant Volume of dry Atmospheric Air, between 32° 

 and 212°F.,and on the Temperature of the Freezing-point 



of Mercury 475 



Proceedings of the Geological Society : — 



Prof. Hind on supposed Glacial Drift in the Labrador Pe- 

 ninsula, Western Canada 476 



Mr. G. Maw on the Drift-deposits of the Valley of the 



Severn 476 



On the Dynamical Theory of Heat, by Joseph Gill, Esq: .... 477 



On the Heat of the Sun's Rays, by M. Hagen 478 



On the State of Meteoric Science, by A. S. Herschel, Esq. . . 479 



NUMBER CLXXXV.— SUPPLEMENT. 



Prof. B. Studer on the Origin of the Swiss Lakes 481 



Mr. A. Cayley on the Theory of Cubic Surfaces 493 



