IV CONTliNTS or VOL. XXV.— Till KD SKRIES. 



Pag« 

 Dr. T. Andrews's Note on the Heat produced during Metallic 



Substitutions 93 



Dr. R. Hare's Strictures on Professor Dove's Essay "On the Law 

 of Storms," introduced by Remarks on Mr. Redfield's recent 



communication on that subject 94 



Prof. Draper's further considerations on the Existence of a 



Fourth Imponderable 103 



Mr. D. Low's Remarks on the Review of a work entitled, " An 

 Inquiry into the Nature of the Simple Bodies of Chemistry," 

 inserted in the Philosophical Magazine for April 1 844 .... 116 

 Mr. R. Hunt's Reply to Professor Draper's Letter in the prece- 

 ding Number of the Philosophical Magazine, on a work en- 

 titled " Researches on Light " 119 



Dr. C. Daubeny on the occurrence of Fluorine in Recent as well 



as in Fossil Bones 122 



Mr. J. T. Way on a Spathic Carbonate of Iron 129 



A Correspondent's Remarks on Sir John F. W. Herschers Ob- 

 servations on the Entrance Passages in the Pyramids of Gizeh 133 

 Sir D. Brewster's Observations on Colour Blindness, or insensi- 

 bility to the impressions of certain colours 134 



Proceedings of the Royal Society 141 



• . Institution of Civil Engineers 148 



Analysis of a Porcelain Clay discovered at Howth, near Dublin, 



by Robert Mallet, Esq 149 



Easter Day, 1845 150 



Eifects of Nascent Oxygen on certain organic Alkalies, by 



Eugene Marchand 152 



On the Hydruret of Copper, by M. Ad, Wurtz 154 



On the Preparation and Projjerties of certain Chlorates, by M. 



Alexander Waechter 156 



Preparation of Protoxide of Gold, by M. L. Figuier 157 



Meteorological Observations for June 1844 159 



Table 160 



NUMBER CLXV.— SEPTEMBER. 



Dr. T. Thomson on Coal-Gas . , 161 



Prof. Draper's Note on the Decomposition of Carbonic Acid by 

 the leaves of Plants under the influence of Yellow Light ... 169 



Mr. G. S. Cundell on a Combination of Lenses for the Photo- 

 graphic Camera Obscura 173 



Prof. Daniell and Dr. Miller's Additional Researches on the 

 Electrolysis of Secondary Compounds 175 



Mr. J. K. Ingram's New Properties of Surfaces of the Second 

 Degree 188 



