iv io\ n:\Ts Di vol. xxvin. — fourth series. 



Page 

 Remarks on the Distillation of Substances of different Volatili- 

 ties, by M. Carey Lea 75 



Note on "the Residual Charge of Electrical Condensers, by M. 



J. M. Gaugain 76 



On the Boiling of Water, and on the Explosion of Steam-boilers, 

 by M. L. Dufour of Lausanne 78 



NUMBER CLXXXVIL— AUGUST. 



Prof. Tyndall on the Absorption and Radiation of Heat by 



Gaseous and Liquid Matter. — Fourth Memoir 81 



Dr. Woods on the Relative Amounts of Heat produced by the 



Chemical Combination of Ordinary and Ozonized Oxygen . . 106 

 Mr. W. F. Barrett on a Physical Analysis of the Human 



Breath 108 



Mr. J. Croll on the Physical Cause of the Change of Climate 



during Geological Epochs 121 



Prof. Stefan on the Dispersion of Light by Quartz, owing to the 



Rotation of the Plane of Polarization 137 



Father Secchi on Earth Currents, and their relation to Electrical 



and Magnetic Phenomena 140 



Pof. Maskelyne and Dr. Lang's Mineralogical Notes (With a 



Plate.) 145 



Dr. Joule on the History of the Dynamical Theory of Heat . . 150 

 Proceedings of the Royal Society : — 



Mr. W. Hugginsand Dr. A. Miller on the Spectra of some 



of the Fixed Stars .... 152 



Mr. P. E. Chase on Aerial Tides 154 



Mr. H. C. Sorby on the Microscopical Structure of Me- 

 teorites 157 



Proceedings of the Geological Society : — 



Mr. T. Codrington on a Section with Mammalian Remains 



near Thame 159 



Mr. E. Witchell on a Deposit at Stroud containing Flint 



Implements, Land and Freshwater Shells, &c 159 



Mr. A. Lennox on the White Limestone of Jamaica, and 



its associated intrusive rocks 159 



Fort-Major T. Austin on the Earthquake which occurred 



in England on the 6th of October, 1863 160 



Apjohn's ' Manual of the Metalloids ' 160 



On the Measurement of the Chemical Brightness of various por- 

 tions of the Sun's Disk, by Thomas Woods, M.D 166 



On the Colouring-Matter of Emeralds, by MM. Wdhler and 



G. Rose 167 



Researches on the Respiration of Flowers, by M. Cahours .. . 167 

 On the Spectral Ray of Thallium, by M. J. Nickles 168 



