CONTENTS of N° 306.— Fourth Series. 



XXXI. On a Relation between Heat and Static Electricity. By 

 Frederick Guthrie page 257 



XXXII. On a new Mechanical Theorem relative to Stationary 

 Motions. By R. Clatjsius 266 



XXXIII. On some Results of the Earth's Contraction from Cool- 

 ing, including a discussion of the Origin of Mountains. By James 



D. Dana. — Part IY. Igneous Ejections, Volcanoes 276 



XXXIV. On the Determination of the Specific Heat of G-ases and 

 Vapours at Constant Volumes. By R. C. Nichols, Esq 289 



XXXV. On the Temperature and Physical Constitution of the 

 Sun. (Second Memoir.) By E. Zollner 290 



XXXVI. On the Moon's Libration. By W. R. Birt, E.R.A.S., 

 E.M.S 305 



XXXVII. Specific-gravity Bottle for Liquids spontaneously In- 

 flammable in contact with Air. By Alfred Tribe, Esq 308 



XXXVIII. On the received principles of Hydrodynamics, in re- 

 ply to Mr. Moon. By Professor Challis, M.A., LL.D., E.R.S., 

 E.R.A.S 309 



XXXIX. Notices respecting New Books : — The Moon, her Mo- 

 tions, Aspect, Scenery, and Physical Condition. By Richard A. 

 Proctor, B.A 312 



XL. Proceedings of Learned Societies : — 



Royal Society : — Mr. G-reville Williams on Emeralds and 

 Beryls. — Part I. On the Colouring-matter of the Emerald . . 314 



Geological Society : — Mr. J. W. Jtjdd on the Secondary Rocks 

 of Scotland ; M. J. E. Campbell on the Grlaciation of Ire- 

 land 326-329 



XLI. Intelligence and Miscellaneous Articles : — 



On Solution of Nitrate of Nickel as an Absorption-Preparation, 

 by Dr. H. Emsmann 329 



Determination of the Eriction Resistances in Atwood's Machine, 

 by C Bender 330 



A remarkable Interference-phenomenon observed by M. Sekulic. 332 



On the Eilling of Vessels with a very Narrow Tube, especially 

 the Cartesian Diver, by K. L. Bauer, of Karlsruhe 334 



Researches on the Spectrum of Chlorophyl, by J. Chautard. . . . 335 



On the Direct Synthesis of Ammonia^ by W. E. Donkin 336 





It is requested that all Communications for this Work may be addressed? 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



