IV CONTENTS OF VOL. XXXVI. — THIRD SERIES. 



Page 

 On the Dry Distillation of Camphorate of Lime, by MM. Ger- 



hardt and Lies-Bodart 67 



Cyanide and Nitruret of Titanium, by M. Wcehler 67 



Analysis of Cast Iron, by F. C. Wrightson, Esq 68 



On the Periodical appearance of Shooting Stars from the 13th 



to the 15th of November, by Von Humboldt 75 



On Terebic Acid, by M. A. Caillot 76 



On the Ethereal Compounds of Terebic Acid, by M. A. Caillot 77 



Paratartaric Acid, by M. Kestner 78 



Meteorological Observations for November 1849 79 



Meteorological Observations made by Mr. Thompson at the 

 Garden of the Horticultural Society at Chiswick, near 

 London ; by Mr. Veall at Boston ; by the Rev. W. Dunbar at 

 Applegarth Manse, Dumfries - shire ; and by the Rev. C. 

 Clouston at Sand wick Manse, Orkney 80 



NUMBER CCXLL— FEBRUARY. 



Dr. Beetz on the Electromotive Force of Gases 81 



The Astronomer Royal on a Problem of Geodesy 96 



Dr. Percy's Chemical Examination of Lettsomite (Velvet Ore) 100 

 Mr. Reuben Phillips on the connexion of the Electricity of Con- 

 densation with Lightning and the Aurora 103 



Mr. A. Duncan, Jun., on two New Salts of Chromic Acid. ... 109 

 Mr. J. Glaisher's Remarks on the Weather during the Quarter 



ending December 31, 1849 110 



Mr. J. R. Young on the Method of developing an Incommen- 

 surable Fraction given in Colson's edition of Sir Isaac New- 

 ton's Fluxions 128 



Mr. H. J. Brooke on Percylite, a Mineral not hitherto de- 

 scribed ; with Chemical Examination, by Dr. Percy 131 



Mr. T. H. Henry on Francolite, a supposed New Mineral .... 134 

 Mr. W. Spottiswoode on the Equation Q=q(w, x,y, z)=w 



+ ix+ji/+kz 135 



Prof. Pliicker's Observations upon M. Boutigny's recent Ex- 

 periment 137 



Proceedings of the Royal Society 139 



Royal Astronomical Society 142 



Dr. Bialloblotzky's Journey to discover the Sources of the Nile 151 



On the Estimation of Antimony, by M. H. Rose 152 



On the association of Silver with Metallic Minerals, and Methods 



of extracting it, by MM. Malaguti and Durocher 153 



On the Presence of Lead, Copper, and Silver in Sea- Water, and 

 of the last Metal in Organized Beings, by MM. Malaguti, 



Durocher and Sarseau 156 



Observations on the Estimation of Lime, by M. Alvaro Reynoso 157 

 On the Presence of Hippuric Acid in the Blood, by MM. F. Ver- 

 deil and Ch. Dolfuss 158 



