IV CONTENTS OF VOL. XXXV. — THIRD SERIES. 



NUMBER CCXXXIV.— AUGUST. 



Page 

 Mr. J. Bryce on the Lignites and Altered Dolomites of the Island 



of Bute 81 



Prof. J. D. Forbes on an Instrument for measuring the Ex- 

 tensibility of Elastic Solids 92 



Prof. J. D. Forbes on the Refractive and Dispersive Power of 



Chloroform 94 



Prof, J. D, Forbes on an Experiment to determine the Earth's 



Density 95 



Mr. E. C. Summers on a Simple Apparatus for Washing Preci- 

 pitates 96 



Dr. Beke on the Sources of the Nile ; being an attempt to 



assign the limits of the Basin of that River 98 



Mr. W. R. Grove on the Effect of surrounding Media on Vol- 

 taic Ignition , 114 



Dr. Fresenius's Practical application of the Law pointed out by 

 Dr. R. D. Thomson, of the proper Balance of the Food in 



Nutrition 127 



Prof. Forbes on the alleged Evidence for a Physical Connexion 

 between Stars forming Binary or Multiple Groups, arising 



from their Proximity alone 132 



Sir W. R, Hamilton on Quaternions ; or on a New System of 



Imaginaries in Algebra (^continued) 133 



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



ending June 30, 1849 137 



Proceedings of the Royal Society 147 



On the Preparation of Pure Oxide of Cobalt, by M. Louyet . . 154 



On Aluminate of Cobalt, by M. Louyet 155 



Detection of Iodine and Bromine, by M. Alvaro Reynoso .... 156 



On the Chemical Nature of the Egg, by M. Barreswil 158 



On the Formation of Fatty Matters in Vegetables, by M. Blon- 



deau de CaroUes 158 



Meteorological Observations for June 1849 159 



Table 160 



NUMBER CCXXXV.— SEPTExMBER. 



Mr. W. R. Birt on the Production of Lightning by Rain .... 161 



Prof. De Morgan on Anharmonic Ratio 165 



Prof. H. Rose on the Inorganic Constituents of Organic Bodies 171 

 M. Weber's Examination of the Inorganic Constituents of 



Peas and Pea-straw 171 



M. Weber's Examination of the Inorganic Constituents of 



Rape-seed and Rape-straw 177 



M. Struve on the Amount of Silica contained in some Plants 181 



