IV CONTENTS OF VOL. XXXIV. FIFTH SERIES. 



Page 

 Mr. T. Mellard Eeade on the Drift Beds of the North 



Wales and Mid- Wales Coast 134 



Mr. E. Wethered on the Microscopic Structure, and Re- 

 sidues insoluble in Hydrochloric Acid, in the Devonian 



Limestone of South Devon 135 



Mr. W. Gibson on the Geology of the Gold-bearing Eocks 



of the Southern Transvaal 135 



Mr. E. G. Mackley Browne on the Precipitation and 



Deposition of Sea-borne Sediment 136 



Mr. E. A. Eloyer on the Geology of the Northern 

 Etbai or Eastern Desert of Egypt ; with an Account 



of the Emerald Mines 137 



Mr. A. Carson on the Eise and Fall of Lake Tanganyika 137 

 Prof. T. G. Bonney on the so-called Gneiss of Carboni- 

 ferous age at Guttannen (Canton Berne, Switzerland). 138 

 Prof. G. A. J. Cole and Mr. G. W. Butler on the Litho- 

 physes in the Obsidian of the Eocche Eosse, Lipari . 138 



Experiments on Electrolytic Polarization, by L. Arons 140 



Note on the Absorption of Eadiant Heat by Alum, by C. C. 



Hutchins , 141 



On the Mechanical Equivalent of Heat, by M. C. Miculescu . 142 

 On the Theory of the Dissociation of Gases, by G. Jager . . 143 



Auroras observed at Godthaab, by Adam W. Paulson 143 



On the Absorption of Light in Turbid Media, by A. Lampa . 144 



NUMBEE CCVIL— AUGUST. 



Lord Eayleigh on the Instability of a Cylinder of Viscous 



Liquid under Capillary Force 145 



Mr. C. Chree on Eotafcing Elastic Solid Cylinders of Elliptic 



Section.-— Part II 154 



Mr. E. Wythe Smith on the Measurement of the Internal 



Eesistance of Cells 173 



Lord Eayleigh on the Instability of Cylindrical Fluid Surfaces 177 



Mr. W. B. Croft on Breath Figures 180 



Messrs. E. Edser and H. Stansfield on a Portable Instrument 

 for Measuring Magnetic Fields ; with some Observations on 

 the Strength of the Stray Fields of Dynamos. (Plates 



III. & IV.) 186 



Prof. F. T. Edgeworth on Correlated Averages 190 



Profs. Liveing and Dewar on the Spectrum of Liquid Oxygen, 

 and on the Eefractive Indices of Liquid Oxygen, Nitrous 



Oxide, and Ethylene 205 



Notices respecting New Books : — 



Dr. T. S. Hunt's Systematic Mineralogy, based on a 



Natural Classification 210 



Mr. A. B. Basset's Treatise on Physical Optics 213 



