CONTENTS OP VOL. XXIII. — FOURTH SERIES. V 



Page 

 Dr. Dawson on the Discovery of some additional Land Ani- 

 mals in the Coal-measures of the South Joggins 239 



Mr. J. G. Veitch on a Volcanic Phenomenon observed at 



Manilla 240 



Mr. J. H. Key on the Bovey Basin, Devonshire 240 



Signor G. G. Gemmellaro on two Volcanic Cones at the 



Base of Etna 241 



Mr. T. Davidson on some Fossil Brachiopoda of the Car- 

 boniferous Rocks of the Punjab and Kashmir 241 



The Rev. O. Fisher on the Bracklesham Beds of the Isle 



of Wight Basin 241 



Prof. Morris and Mr. G. E. Roberts on the Carboniferous 



Limestone of Oreton and Farlow 243 



Mr. E. W. Binney on some Fossil Plants from the Lower 



Coal-measures of Lancashire 244 



The Rev. S. Hislop on the Plant-beds of Centra] India . . 244 



On a Dew-bow seen on the surface of Mud, by W.J. M. Rankine. 245 



Note on the Theory of Spherical Condensers, by J. M. Gaugain. 245 



On the Action of Nitrate of Sodium on Sulphide of Sodium at 



different Temperatures, by Dr. Ph. Pauli^ 248 



NUMBER CLIV.— APRIL. 



Prof. Magnus on the Passage of Radiant Heat through moist 



Air, and on the Hygroscopic Properties of Rock Salt 249 



Prof. Tyndall on Recent Researches on Radiant Heat 252 



Mr. A. Cayley on the Transformation of a certain Differential 



Equation 266 



Sir W. R. Hamilton's Elementary Proof, that Eight Perimeters, 

 of the Regular inscribed Polygon of Twenty Sides, exceed 



Twenty-five Diameters of the Circle 267 



Mr. S. V. Wood on the Form and Distribution of the Land-tracts 

 during the Secondary and Tertiary Periods respectively ; and 

 on the effects upon Animal Life which great Changes in Geo- 

 graphical Configuration have probably produced 269 



Mr. W. H. L. Russell's Theorems in the Calculus of Symbols. 282 

 Mr. T. Tate's Experimental Researches on the Laws of Evapo- 

 ration and Absorption 283 



Mr. T. Graham on Liquid Diffusion applied to Analysis 290 



Col. Sir H. Jame3 and Capt. A. R. Clarke on Projections for 

 Maps applying to a very large extent of the Earth's Surface. 



(With a Plate.) 30G 



Prof. Tyndall on the Regelation of Snow-granules 312 



Prof. Challis on the Principles of Theoretical Physics 313 



Notices respecting New Books : — Mr. W. Odling's Manual of 

 Chemistry, Descriptive and Theoretical 322 



