IV CONTENTS OF VOL. XXIX. FOURTH SERIES. 



NUMBER CXCIV.— FEBRUARY. 



Page 

 Mr. J. J. Waterston on some Electrical Experiments and In- 

 ductions. (With a Plate.) 81 



Prof. Potter's examination of the applicability of Mr. Alex- 

 ander's Formula for the elastic force of Steam to the elastic 

 force of the Vapours of the Liquids, as found by the experi- 

 ments of M. Regnault 98 



Prof. Cayley on Quartic Curves 105 



Mr. A. G. Girdlestone on the condition of the Molecules of 



Solids , m 108 



Prof. Wanklyn on Vapour- densities Ill 



Prof. A. vonWaltenhofen on an anomalous Magnetizing of Iron 113 



Mr. J. Hunter on the Absorption of Gases by Charcoal 116 



Dr. Hargreave on Differential Equations of the First Order. 



Extension of Integrable Forms 121 



Mr. D. Forbes's Researches on the Mineralogy of South 



America 129 



Dr. C. K. Akin's further Statements concerning the History of 



Calcescence 136 



Proceedings of the Royal Society : — 



Mr. W. Huggins on the Spectra of some of the Nebulas. . 151 

 Prof. Maxwell on a Dynamical Theory of the Electromag- 

 netic Field 152 



Proceedings of the Geological Society : — 



Dr. Hector on the Geology of Otago, New Zealand .... 157 

 Sir R. I. Murchison on the Glaciers and Rock-basins of New 



Zealand 158 



Dr. Haast on the Causes which have led to the Excavation 

 of deep Lake-basins in hard Rocks in the Southern Alps 



of New Zealand 158 



Dr. Haast on a Sketch-map of the Province of Canterbury, 



New Zealand 159 



On some Thermo-electric Piles of great activity, by Prof. R. 



Bunsen 159 



On the Radiant Heat of the Moon, by Buys Ballot 1 62 



On Calorescence, by Prof. Tyndall 164 



Reply to certain Charges made by Charles Babbage, Esq., 



F.R.S., against the late Sir Humphry Davy 1 64 



Simple Method of preparing Thallium, by Prof. R. Bunsen.. . 168 



NUMBER CXCV— MARCH. 



Mr. T. 11. Edmonds on the Elastic Force of Steam of Maximum 

 Density ; with a new Formula for the expression of such force 



in terms of the Temperature 1 69 



Prof. A. W. Williamson on the Unit-volume of Gases 188 



Mr. J. J. Waterston on some Electrical Experiments and Induc- 

 tions 192 



