CONTENTS. VU 



Page 



Gresham College : Prof. Pullen's Lectures on Astronomy .... 454 



On the Influence of Heat, &c. on the Circulation of the Chara 457 



Oxalo-Nitrate of Lead 459 



Action of Iron at a high Temperature on Benzoic Acid : Benzin 460 



Action of Iron at a high Temperature on Camphor 460 



On Chloride of Tungsten, by M. Heinrich Rose 461 



Fall of Meteoric Stones in Brazil 462 



On the Adulteration of Carmine, by C. G. Ehrenberg 462 



Meteorological Observations 463 



NUMBER LXXVIL— JUNE. 



Gustave Rose on the Formation of Calc Spar and Arragonite 465 



Prof. R. Hare's Observations on Sulphurous ^ther, and Sul- 

 phate of ^therine (the true Sulphuric ^ther) 474 



Prof. Johnston on a supposed Analogy in Atomic Constitution 

 between the Earthy Carbonates and Alkaline Nitrates 480 



Mr. Potter's Reply to the Observations of J. H. Wheeler, Esq., 

 on the Method of computing the Results of Experiments 

 with the Comparative Photometer 484 



Mr. Laming on the primary Forces of Electricity. 486 



Mr. J. Hogg's Specimen of a Thermometrical Diary kept abroad 

 in the Years 1824, 1825, and 1826; and compared with 

 a corresponding one made in London during the like Period 498 



Mr. T. Wright's Observations on Dr. Buckland's Theory of the 

 Action of the Siphuncle in the Pearly Nautilus 503 



Proceedings of the Geological, Royal Astronomical, Zoological, 

 and Linnsean Societies ; of the Royal Institution : Friday 

 Evening Meetings : Mr. Brayley on the Theory of Volcanos. . 508 



New Books : — Description d'une Collection de Miner aux, form^e 

 par M. Henri Heuland, et appurtenant d, M. C. H, Turner. ... 536 



On the Electrical Currents produced during the Processes of 

 Fermentation, by Mr. J. Blake 539 



On the Decomposition of Water by Thermo-Electricity, by 

 Mr. F. Watkins 541 



Discovery of the North-west Passage, under the Instructions 

 of the Hudson's Bay Company, by Messrs. Dease and Simp- 

 son 542 



African Discovery 543 



Meteorological Observations 543 



NUMBER LXXVIII.— SUPPLEMENT. 



Prof. Forbes's Researches on Heat. Second Series 545 



Prof. Johnston on the Composition of certain Mineral Substances 



of Organic Origin 560 



Proceedings of the Geological, Zoological, and Meteorological 



Societies 564 



