CONTENTS OF VOL. XXVI. 



(FOURTH SERIES.) 



NUMBER CLXXIL— JULY 1863. 



Page 



Prof. Buff on the Relation between the Temperature and the 

 Tension of Vapours 1 



Mr. G. Gore on a new Gas-Furnace for Experimental, Analy- 

 tical, and other purposes 15 



Mr. A. Cayley on the Problem of Pedal Curves 20 



Prof. Magnus on the Diathermancy of Dry and Moist Air (With 

 a Plate.) 21 



Prof. Tyndall on the Relation of Radiant Heat to Aqueous 

 Vapour 30 



Prof. Tyndall on the Passage of Radiant Heat through Dry and 

 Humid Air 44 



Mr. W. Crookes on the Discovery of the Metal Thallium .... 55 



Mr. T. Carrick on the Tides and the Earth's Rotation 63 



Prof. Tyndall' s Remarks on Professor Tait's last Letter to Sir 

 David Brewster 65 



Proceedings of the Royal Society : — 



Mr. T. Sutcliffe on some remarkable Hailstones which fell 



at Headingley, near Leeds, on the 7th of May, 1862 . . 67 

 Mr. R. Moon on the true Theory of Pressure as applied to 

 Elastic Fluids 70 



Biographical Notice of the late John Taylor, Esq., F.R.S., 

 F.G.S., &c 73 



On the Wave of High Water, with Hints towards a New Theory 

 of the Tides, by Thomas Carrick, Esq 79 



NUMBER CLXXIII.— AUGUST. 



M. L. Lorenz on the Theory of Light 81 



Mr. C. Tomlinson's Experimental Examination of the so-called 



Storm-glass 93 



Mr. J. Gill on the Dynamical Theory of Heat 109 



Mr. J. J. Waterston on the Expansion of Water at High Tem- 

 peratures. (With Three Plates.) 116 



Prof. Maskelyne and Dr. Lang's Mineralogical Notes 134 



Prof. Marcet on the Effects of Nocturnal Radiation within the 



Tropics 140 



