CONTENTS OF VOL. XXVIII.— FOURTH SERIES. V 



NUMBER CLXXXVIIL— SEPTEMBER. 



Page 

 Prof. Mitscherlich on the Spectra of Compounds and of Simple 



Substances. (With Two Plates.) . . 169 



Prof. Breithaupt on the Quartz from Euba, and on the Biaxial 



character of Pyramidal and Rhombohedral Crystals 190 



Prof. Norton on Molecular Physics 192 



The Hon. Chief Justice Cockle on the Operating Symbol of 



Differential Covariants 205 



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



Liquids • ■ • ••••■•.' 206 



Mr. G. F. Rodwell on some Effects produced by a Fluid in 



Motion,— No. II. On the Trompe. (With a Plate.) 209 



Dr. Atkinson's Chemical Notices from Foreign Journals 225 



Proceedings of the Royal Society : — 



Dr. T. R. Robinson on a New Mercurial Gasometer and 



Air-pump 235 



Proceedings of the Geological Society : — 



Captain Godwin-Austen on the Geology of part of the 



North-western Himalayas 241 



Prof. Huxley on the Cetacean Fossils termed Ziphius by 

 Cuvier, with a notice of a new species (Belemno ziphius 



compressus) from the Red Crag • • • - 241 



Mr. W. B. Dawkins on the Rhsetic Beds and White Lias of 

 Western and Central Somerset, and on the Discovery 

 of a new Fossil Mammal in the Grey Marlstones beneath 



the Bone-bed 242 



Dr. Holl on the Geological Structure of the Malvern Hills 



and adjacent District 243 



On the Rotatory Power of Active Liquids and of their Vapours, 



by M. D. Gernez 243 



Inversion of the Absorption Bands in the Spectrumof Didymium, 



by R. Bunsen 246 



On a New Polarizing Prism, by Prof. H. W. Dove 247 



On the Optical Properties of Carthamine, by Prof. H.W. Dove. 247 



NUMBER CLXXXIX.— OCTOBER. 



Dr. H. Draper on the Photographic Use of a Silvered- Glass 



Reflecting Telescope 249 



Prof. Tyndall on the Conformation of the Alps ; . 255 



Prof. Potter on the Law of the Expansion of the Gases by in- 

 crease of Temperature 271 



Prof. Norton on Molecular Physics 276 



Dr. Rankine on the Properties of certain Stream-Lines 282 



Mr. P. G. Tait on the History of Thermo-dynamics 288 



