CONTENTS of N° 301.— Fourth Series. 



XLI. On the Ultramundane Corpuscules of Le Sage, also on the 

 Motion of Rigid Solids in a Liquid circulating irrotationally through 

 perforations in them or in a Fixed Solid. By Sir William 

 Thomson, F.R.S page 321 



XLII. On the Absorption of the Chemically Active Rays in the 

 Sun's Atmosphere. By H. C. Vogel 345 



XLIII. On the Effects of Magnetization in changing the Dimen- 

 sions of Iron, Steel, and Bismuth bars, and in increasing the Interior 

 Capacity of Hollow Iron Cylinders. — Part. I. By Aleeed M. Matee, 

 Ph.D., Professor of Physics in the Stevens Institute of Technology, 

 Hoboken, New Jersey, U.S. A 350 



XLIY. On the Intensity of Light &c. By Heney Hudson, M.D., 

 M.E.I.A 359 



XLV. On the Definition of Intensity in the Theories of Light and 

 Sound. By Robeet Moon, M.A., Honorary Fellow of Queen's Col- 

 lege, Cambridge 361 



XLYI. On Diffraction. By GL Quinces 365 



XL VII. On certain Early Logarithmic Tables. By Professor D. 



BlEEENS DE HAAN 371 



XLVIII. On Early Logarithmic Tables, and their Calculators. 

 By J. "W. L. Glaishee, B.A., Fellow of Trinity College, Cambridge. 376 



XLTX. Notices respecting New Books : — Celestial Objects for 

 Common Telescopes. By the Rev. T. "W. Webb. — Report presented 

 to the Board of Visitors of the Royal Observatory, Edinburgh. By 



C. Piazzi Smyth 382 



L. Proceedings of Learned Societies : — 



Royal Society : — Messrs. J. Dewae and W. Dittmae on the 

 Vapour-density of Potassium ; Mr. C. Tomlinson on Super- 

 saturated Saline Solutions ; The Eael of Rosse on the Ra- 

 diation of Heat from the Moon, the Law of its Absorption 

 by our Atmosphere, and its variation in amount with her 



Phases . .: 384-391 



Geological Society ; 391-394 



LI. Intelligence and Miscellaneous Articles : — 



On a new Determination of the Velocity of Light, by M. A. 



Cornu 394 



New Experiments on Singing Flames, by Fr. Kastner 397 



On a new Operation by which the Velocity of Projectiles can 



be determined Optically, by Marcel Deprez 398 



On the Development of Heat by the Friction of Liquids against 

 Solids, by O. Maschke 400 



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 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



