iv CONJ F.NTS. 



Page 

 Frof. Fuchs on a new Method of analysing the Ores of Iron, 



and Crude Iron 90 



Mr. J. Williams on the Electricity of Steam 93 



Dr. C. Schafhaeutl on the Circumstances under which Steam 



developes Positive Electricity , 95 



M. Peltier on the Phsenomena of the Electricity of Steam, ob- 



sened by Mr. Pattinson and Mr. Armstrong 100 



Dr. L. Playfair on a new Fat Acid in the Butter of Nutmegs. . 102 

 Abstract of recent Researches on the Constitution of the fatty 

 Substances made by MM. Redtenbacher, Varrentrapp, Mayer 



and Bromeis 113 



Mincralogical Notices from Foreign Journals : Antigoritc, by 

 MM. Wiser and Schweizer ; Pennine, by Prof. J. Frobel 

 and M. Schweizer; Chlorospinelle and Xanthophyllite, by 



Prof. G. Rose ; Pikrophyll, by A. F. Svanberg 120 



Mr. J. Stenbouse on Artificial Oil of Ants 122 



Mr. R. G. Latham's Facts and Observations relating to the 



Science of Phonetics 1 24 



The Rev. J. Challis's Reply to Mr. Airy's Remarks on Professor 

 Challis's Investigation of the Motion of a small Sphere vi- 

 brating in a resisting Medium 130 



Mr. Airy's Correction in a paper published in the Philosophical 



Magazine for January 1 841 132 



Mr. W. G. Armstrong on the Electricitj' of expanding Air, as 

 connected with the Electrical Phsenomena of Effluent Steam 133 



Dr. Aquila Smith on Irish Tin Ore 134 



Prof. J. J. Sylvester's Introduction to an Essay on the Amount 

 and Distribution of the Multiplicity of the Roots of an Alge- 

 braic Equation 136 



Proceedings of the Royal Society 139 



Royal Astronomical Society 141 



Dr. G. O. Rees's Analysis of Chyle and Lymph 156 



New Mineral from Langbanshytta, near Fahlun ; described and 



analysed by Professor O. B. Kiihn of Leipzig 157 



Remarkable Solar Bow 158 



Meteorological Obser^•ations for December 1840 159 



Table 160 



NUMBER CXVI.-MARCH. 



The Rev. B. Powell on certain points in the Thcoiy of Undula- 

 tions, related to the Hypothesis of the Symmetrical Arrange- 

 ment of the Molecules 161 



Mr. W. S. Harris on Lightning Conductors, and on Experi- 

 ments relating to the Defence of Shipping from Lightning 172 



Mr. R. Thomas's Remarks on Prof. Whewell's Paper on the 

 Mean Level of the Sea 1 83 



