IV CONTENTS OF VOL. III. FOURTH SERIES. 



NUMBER XVI.— FEBRUARY. 



Page 

 Dr. Tyndall's Reports on the Progress of the Physical Sciences. 



(With a Plate.) , 81 



On Thermo-electric Currents, by Prof. Magnus of Berlin. 

 Experiments of MM. Svanberg and Franz on Mono- 

 thermic Electricity. Application of the results of M. 

 Magnus to the solution of certain difficulties encoun- 

 tered by M. Regnault 81 



Dr. Schlagintweit's Observations in the Alps on the Optical 



Phenomena of the Atmosphere 92 



Dr. Andrews on a Method of obtaining a perfect Vacuum in the 



Receiver of an Air-pump 104 



Prof. Wartmann on the Polarization of Atmospheric Heat ... . 108 

 Mr. G. B. Jerrard's Notes on the Resolution of Equations of 



the Fifth Degree 112 



Mr. M. Donovan on the supposed Identity of the Agent con- 

 cerned in the Phenomena of ordinary Electricity, Voltaic 

 Electricity, Electro -magnetism, Magneto -electricity, and 



Thermo-electricity 117 



Dr. Tyndall's Remarks on the Researches of Dr. Goodman "On 

 the Identity of the Existences or Forces, Light, Heat, Elec- 

 tricity and Magnetism " 127 



Mr. R. Carmichael on Homogeneous Functions, and their Index 



Symbol 129 



Prof. Chapman's Mineralogical Notes 141 



Prof. Buff on the Electrical Properties of Flame 145 



Notices respecting New Books : — Ramchundra's Treatise on 



Problems of Maxima and Minima, solved by Algebra 148 



Proceedings of the Royal Society 149 



Light for Illumination obtained from the Burning of Hydrogen, 



by M. Gillard 152 



On the Crystallization of Sulphur, by Ch. Brame 154 



On the Electro-magnetic Motor of Fessel, by M. Plucker .... 155 



Present condition of Vesuvius 156 



On the Sulphur Deposits at Zwoszowice and Radoboj 157 



Meteorological Observatory of Mount Vesuvius 158 



Experiments on the Application of Electro- magnetism as a Mo- 

 tive Force, by M. Aristide Dumont 158 



Meteorological Observations for December 1851 159 



Table 160 



NUMBER XVII.— MARCH. 



Dr. Herapath on the Optical Properties of a newly-discovered 

 Salt of Quinine. (With a Plate.) 161 



Dr. Tyndall's Reports on the Progress of the Physical Sciences : 

 P. Riess on Electric Currents of the First and Higher Orders 173 



Mr. K. Ache on some Thermo-electiical Experiments 185 



