CONTENTS OF VOL. XIX.—FOURTH SERIES. 
Mr. J. Spiller on the Composition of the Photographic Image. . 
M. Foucault and Prof. Kirchhoff on the Simultaneous Emission 
and Absorption of Rays of the same definite Refrangibility. . 
Mr. J. Cockle on the Theory of Equations of the Fifth 
Merree (coneluded oie eel bid sates cea. Wa! tiedelels's Sia wee 
M. J. Jamin on the Equilibrium and Motion of Liquids in Porous 
IOGIERS Natta) dt AeA Saas ast Oh Metta’. ok otk 
Dr. Atkinson’s Chemical Notices from Foreign Journals. ..... 
Prof. Dufour’s Instructions for the better observation of the 
semis lagion of the Stars... . sawiaees se te 0 3 ett bak. 
Proceedings of the Royal Society :— 
Mr. A. J. Ellis on the Laws of Operation, and the System- 
auzation of Mathematies:o.)jsisaiz’ siveles a0 of ots) e sai 
Dr. Hofmann on New Derivatives of Phenylamine and 
Fighiy laine. bo Kiri.) 2 cath ede tre OR ae EP Sectens 
Proceedings of the Geological Society :-— 
Prof. J. Phillips on some Sections of the Strata near Oxford 
Prof. Harkness on the Old Red Sandstone and the Meta- 
morphic Rocks on the Southern Margin of the Grampians 
Mr. A. Geikie on the Old Red Sandstone of the South of 
Proceedings of the Royal Institution :— 
Prof. Tyndall on the Influence of Magnetic Force on the 
Electric Discharge . . 
On the Correlation of Physical, “Chemical, “and Vital Force, 
byidames Hinton, Bigs iio). a ateielyed No dutta tes dekh ante « 
On the Conductibility of certain Alloys for Heat and Electricity, 
Eyata, Waederinans!.: yi Y', iibmine Welt be ote a eaisia ds 
NUMBER CXXVII.—APRIL. 
M. H. Fizeau on the Effect of the Motion of a Body upon the 
Velocity with which it is traversed by Light ..... 
Mr. T. Tate on a new Instrument for the "Mechanical Trisec- 
tion of an Angle; and on the Multisection of an Angle. . 
Mr. M. Ponton on certain Laws of Chromatic paieere (con- 
tinued) j 
Mr. G. B. Jerrard’s Remarks on Mr. Harley’ s paper on Quintics. 
Archdeacon Pratt: Is the Probiem, ‘‘ How far is the mass of 
the earth solid and how far fluid ?”’ excluded from the domain 
EPORIMIV Ee SCRERCO Eo sc: aiusk ls Larrashsn i dislayeld viva 4 sip waiele «es 
Dr. Atkinson’s Chemical Notices from Foreign Journals 
Mr. R. P. Greg on Luminosity of Meteors from Solar Reflexion. 
Mr. R. V. Tuson on a Carbonate of Lead from Leaden Coffins. 
Prof. Mallett on Osmious Acid, and the position of Osmium in 
the list of Elements .. bia Baik Brash 
Vv 
Page 
186 
193 
197 
204 
207 
216 
224 
232 
235 
236 
237 
238 
243 
243 
245 
261 
263 
272 
274 
277 
287 
291 
293 
