CONTENTS of N° BOO.— Fourth Series. 



XXX. On Spectral Lines of Low Temperature. By The Marquis 



of Salisbury, E.E.S page 241 



XXXI. On an advantageous Method of using the Differential 

 Galvanometer for measuring small Eesistances. By Oliver Heavi- 

 side, Great Northern Telegraph Company, Newcastle-on-Tyne .... 245 



XXXII. On the Optics of Mirage. (Second Paper.) By Pro- 

 fessor Everett, M.A., D.C.L., Queen's College, Belfast 248 



XXXIII. On a simple Device for projecting on a Screen the De- 

 flections of the Needles of a Galvanometer. By Alfred M. Mater, 

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

 Hoboken, New Jersey, U.S.A 260 



XXXIV. On Differential Galvanometers . By Louis Schwekdler, 

 Esq 263 



XXXV. On Fractional Distillation. By J. C. GrLASHA^, Strath- 

 roy, Ontario 273 



XXXVI. On the Action of Solid Bodies on Gaseous Supersatu- 

 rated Solutions. By Charles Tomllin t so:n", E.E.S. ., 276 



XXXVII. On Galvanic Induction. By A. P. Sukdell 283 



XXXVIII. The Vibrations which Heated Metals undergo when 

 in contact with cold Material, treated mathematically. By A. S. 

 Davis, M.A. 296 



XXXIX. Proceedings of Learned Societies : — 



Eoyal Society : — The President on a supposed Alteration in • 

 the Amount of Astronomical Aberration of Light produced by 

 the Passage of the Light through a considerable thickness of 

 Eefracting Medium; Dr. W. Huggins on the "Wide-slit 

 Method of viewing the Solar Prominences ; Mr. E. H. M. 

 Bosanquet on Just Intonation in Music ; Mr. F. Guthrie 

 on a new Eelation between Heat and Electricity ; M. A. O. 

 Des Cloizeaux on a new Locality of Amblygonite, and on 

 Montebrasite, a new Hydrated Aluminium and Lithium 

 Phosphate : . 306-311 



Geological Society 311-314 



XL. Intelligence and Miscellaneous Articles : — 



On the Electrical Eesistance of Metals, by M. Benoist 314 



On the conditions requisite for the Maximum of Eesistance of 

 Galvanometers, by M. Th. Du Moncel 317 



On Stratification in a Liquid in Oscillatory Motion, by J. Stefan. 320 



.* It is requested that all Communications for this Work may be addressed? 

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

 Lion Court, Fleet Street, London. 



