CONTENTS OF VOL. XXXIV. THIRD SERIES, V 



Page 



On the Rationale of the Explosion causing the great Fire of 1 845 



at New York, by Dr. Hare 227 



Preparation of Iodide of Lead, by M. T. Huraut 231 



On the Protogine of the Alps, by M. Delesse 233 



Examination of Madder, by M. Debus 1,236 



Analyses of Felsite, Oligoclase and Muromontite 237 



On the Ferrocyanides of Strychnia and Brucia, by M. D. Brandes 238 



Meteorological Observations for January 1849 239 



Table 240 



NUMBER CCXXIX.— APRIL. 



Dr. J. W. Draper on the Existence and Effects of Allotropism 



in the constituent elements of Living Beings 241 



Prof. Potter on the discovery of the Chilling Process in the cast- 

 ing of the Specula for Reflecting Telescopes, &c 246 



Mr. J. Phillips's Thoughts on Ancient Metallurgy and Mining 

 in Brigantia and other parts of Britain, suggested by a page 



of Pliny's Natural History 24 7 



The Rev. B. Bronwin on the Determination of the Coefficients 

 in any series of Sines and Cosines of Multiples of a variable 



angle from particular values of that series 260 



MM. L. Foucault and J. Regnault on some phsenomena of Bi- 

 nocular Vision 269 



Mr. J. Glaisher on the Meteorology of England in the year 1847 271 

 Prof. J. R. Young on the decomposition of Functions into Con- 

 jugate Factors ; with some consequences deducible therefrom 278 

 The Rev. J. Challis on the Theoretical Value of the Velocity of 



Sound, in Reply to Mr. Stokes 284 



M. A. de la Rive on the Diurnal Variations of the Magnetic 



Needle, and on Auroras Boreales 286 



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



Imaginaries in Algebra {continued) 294 



Notices respecting New Books : — M. A. Quetelet's Letters ad- 

 dressed to H.R.H. the Grand Duke of Saxe Coburg andGotha, 

 on the Theory of Probabilities ; Mr. R. Patterson's First 



Steps to Zoology 297-298 



Proceedings of the Royal Society 299 



On Anhydrous Nitric Acid, by M. Deville 314 



On a Series of Organic Alkalies homologous with Ammonia, by 



A.Wurtz 316 



On the Existence of Mercury in the Tyrol, by M. H. Rose . . 318 



Rectification of Spirit of Nitrous JEther, by M. Klauer 319 



Meteorological Observations for February 1849 319 



Table 320 



