s CONTENTS OF VOL. XXX. FOURTH SERIES. V 



Page 

 On the Nature of the Invisible Photographic Image, by M. 



Carey Lea, Philadelphia 238 



Experiments on the Production of Cylinders of Ice by Pressure 



through Orifices, by M. Tresca 239 



Note on the Reflexion of Sound, by M. Vionnois 210 



NUMBER CCIII.— OCTOBER. 



Dr. Rankine on the Second Law of Thermodynamics 241 



Prof. Thomsen on the Mechanical Equivalent of Light 246 



Dr. Atkinson's Chemical Notices from Foreign Journals 249 



Prof. Challis's Supplementary Researches in Hydrodynamics. — 



Partll. 258 



Mr. A. Claudet on Moving Photographic Figures, illustrating 

 some Phenomena of Vision connected with the combination 

 of the Stereoscope and the Phenakistoscope by means of Pho- 

 tography 271 



Prof. Norton on Molecular Physics 276 



Prof. Young on Newton's Rule for Imaginary Roots 289 



Dr. Schunck on some Products derived from Indigo-blue 293 



Notices respecting New Books : — Lieut. -Colonel W. H. Oakes's 

 Table of the Reciprocals of Numbers, from 1 to 100,000, with 

 their differences, by which the reciprocals of numbers may be 



obtained up to 10,000,000 312 



Proceedings of the Royal Society : — 



Messrs. B. Stewart and P. G. Tait on the Heating of a 



Disk by rapid Rotation in vacuo 314 



Contributions to the knowledge of Indium, by Professor Schrotter. 318 

 On the Visual Sensations produced by Intermittent Excitations 



of the Retina, by Prof. E. Mach of Graz 319 



Inversion of the Absorption-bands in the Spectrum of Erbium, 

 by Prof. Bahr of Upsala 320 



NUMBER CCIV.— NOVEMBER. 



Mr. W. F. Barrett on some Physical Effects produced by the 



contact of a Hydrogen- flame with various Bodies 321 



Mr. P. E. Chase on Gravity and Magnetic Inclination 329 



Dr. Flight on the Thermo-electric Tension of Minerals 337 



Prof. Cayley on a Triangle in- and circumscribed to a Quartic 



Curve 340 



Prof. Plateau on the Conditions of Stability of thin Films of 



Liquids. — Second Part 343 



The Hon. Chief Justice Cockle on Quantoids 347 



Mr. A. Bird on a Water-Barometer. (With a Plate.) 349 



Dr. Atkinson's Chemical Notices from Foreign Journals .... 356 



