IV CONTENTS OF VOL. II. FIFTH SERIES. 



Page 



M. F. Mohr on the Views of the Nature of Heat 110 



Mr. R. Moon on 1 1 ohnholtz's Memoir on the Conservation of 

 Force; and on the more Modern Mode of Presenting his 



Theory 114 



Mr. W. Baily on the Optical Properties of Starch 123 



Mr. N. S. Maskelyne on the Pitted Surface of Meteorites 126 



Lient.-Col. A. R. Clarke on the Elasticity of Brass 131 



Mr. O. ileaviside on the Extra Current 135 



Proceedings of the Eoyal Society : — 



Mr. W. Crookes on Eepulsion resulting from Eadiation 145 

 Proceedings of the Geological Society : — 



Mr. W. A. E. Ussher on the Triassic Eocks of Somerset 



and Devon 152 



Eeport on some Experiments of Dr. E. Eoot, of Boston, con- 

 cerning the Penetration of Platinum by Electrolytic Gases, 



by Dr. Helmholtz '. 153 



On Eoscoelite — a Vanadium Mica, by E. A. Genth 156 



On Heat-Spectra, by M. Aymonnet 158 



NUMBEE X.— SEPTEMBEE. 



Mr. M. M. Pattison Muir on Isomerism 161 



Prof. Challis on the Hydrodynamical Theory of Attractive and 



Repulsive Eorces 172 



Mr. S. P. Thompson on some Phenomena of Induced Electric 



Sparks. (Plate II.) 191 



Prof. P. E. Chase on the Nebular Hypothesis. — IV. Correla- 

 tions of Central Eorce 198 



Mr. J. E. H. Gordon on a repetition of Dr. Kerr's Experiments 



on a new Eelation between Electricity and Light 203 



Mr. J. W. L. Glaisher on a Multiple Differentiation of a cer- 

 tain Expression 208 



Mr. F. Guthrie on Salt Solutions and Attached Water 211 



Notices respecting New Books : — 



Mr. E. Neison on the Moon, and the Condition and Con- 

 figurations of its Surface 225 



Prof. IV. King on the Superinduced Structure of Eocks, 



called Jointing ; and its relation to Slaty Cleavage . . 228 

 Lieut. C. "VVeyprecht on the Fundamental Principles of 



Arctic Investigation 228 



Proceedings of the Eoyal Society : — 



Mr. J. N. Lockyer on the Compound Nature of the Line 



Spectra of Elementary Bodies 229 



Prof. O. Eeynolds on the Force caused by the communi- 

 cation of Heat between a Surface and a Gas, and on a 

 New Photometer , , 231 



