IV CONTENTS OF VOL. XLV. FOURTH SERIES. 



Page 

 Dr. R. Konig on Manometric Flames. (With a Plate.) .... 105 

 Mr. 0. Heaviside on the best Arrangement of Wheatstone's 

 Bridge for measuring a given resistance with a given Galva- 

 nometer and Battery 114 



Mr. H. A. Smith on the Chemistry of Sulphuric Acid-manufac- 

 ture 121 



Mr. J. A. Wanklvn on Fractional Distillation 129 



Proceedings of the Royal Society : — 



Dr. W. Huggins on the Spectrum of the Great Nebula in 

 Orion, and on the Motions of some Stars towards or 



from the Earth 133 



Mr. J. N. Lockyer's "Researches in Spectrum Analysis in 



connexion with the Spectrum of the Sun 147 



Proceedings of the Geological Society : — 



Mr. "W. J. Sollas on the Upper Greensand Formation of 



Cambridge .• 148 



Dr. G. Henderson on Sand-pits, Mud-volcanoes, and 

 Brine-pits met with during the Yarkand Expedition of 



1870 149 



Mr. W. B. Dawkins on the Cerviclse of the Forest-bed of 



Norfolk and Suffolk 149 



Mr. W. B. Dawkins on the Classification of the Pleisto- 

 cene Strata of Britain and the Continent by means of 



the Mammalia 150 



On the Invention of the Water Air-pump, by H. Sprengel . . 153 

 Report on the Researches of M. Arn. Thenard concerning 

 the Actions of Electric Discharges upon Gases and Yapours, 



by Edm. Becquerel 154 



On the great Barometric Depression of January, by W. R„ Birt. 156 

 On the Thermal Effects of Magnetization, by J. Moutier .... 157 



Encke's Comet 159 



On the Intensity of Sound and Light, by Henry Hudson, M.D., 

 M.R.I.A ." 160 



NUMBER CCXCIX.— MARCH. 



Prof. Everett on the Optics of Mirage 161 



Mr. R. H. M. Bosanquet's Correction to a Paper " On an Ex- 

 perimental Determination of the Relation between the Energy 

 and Apparent Intensity of Sounds of different Pitch " . . . . 173 

 Dr. J. Hopkinson on the Effect of Internal Friction on Reso- 

 nance 176 



M. F. C. Henrici on the Action of Solid Bodies on [Gaseous] 



Supersaturated Solutions 183 



Mr. J. W. L. Glaisher on Arithmetical Irrationality 191 



Mr. T. T. P. B. Warren on a Method of Testing Submarine 

 Telegraph Cables during Paying-out 199 



