i? CONTENTS. 



Maclureite , 73 



Combustion of a Stream of Hydrogen Gas under Water 73 



Fusion and Volatilization of Charcoal 73 



Alteration of the freezing Point of Thermometers by being long kept .... 74 



Excrement of the Boa », i 74 



Heliotrope » ,. .^ I7» • ^J • .... f .. f ...... , 75 



Carbonate of Magnesia and Iron 75 



Absence of Carbonic Acid in the Atmosphere over the Sea . V 75 



Hydriodide of Carbon 76 



New Scientific Books 76 



New Patents , 77 



Mr. Howard^ Meteorological Journal. 79 



NUMBER II.— AUGUST. 



New Experiments on Sound, By Mr. C. Wheatstone 81 



On Granite Veins. (With a Plate,) go 



Instructions for the Application of the Barometer to the Measurement of 



Heights. By Baden Powell, MA 95 



Register of Rain, kept at Bombay, By B. Noton, Esq ill 



Account of some Experiments with the Prism. By S. L. Kent, Esq 1 15 



On the Crystalline Forms of Artificial Salts. By H. J.Brooke, Esq. FRS. 



and FLS. {continued},,, ,,_ 1 17 



Constitution and Mode of Action of Volcanoes. By A. Von Humboldt 121 



On Napthaline. By Mr. F. C. Chamberlain 135 



Astronomical Observations. By Co|. Beaufoy, FRS 138 



Analytical Account of Dr. Henry's Elements of Chemistry. 138 



of Mr. Brooke's Familiar Introduction of Crystallo- 

 graphy .....,.rftf....f 143 



Proceedings of the Linnean Society ,..,.... ,r, , , . 151 



————— Geological Society , 154 



Dr. Wollaston's Method of detecting Magnesia on the smallest Scale .... 155 



Phosphate of Uranium , 156 



On the Use of the Electrical Faculty of the Torpedo 156 



New Scientific Books , 1 57 



New Patents 158 



Mr. Howard's Meteorolqgical Journal,. J59 



NUMBER III.— SEPTEMBER. 



Instructions for the Application of the Barometer to the Measurement of 

 Heights. By Baden Powell, MA, (coTi/mMed) 161 



List of Substaiices arranged according to their Thermoelectric Relations. 

 By the Rev. J. Cumming, MA. FRS. and Professor of Chemistry in 

 ^he University of Cambridge 1 77 



