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^CONTENTS 



va 



Page. 



397 



398 



XLL On the Crystallographic Identity of Eumanite and Brooklte ; 

 by J. D. Dana, -- - 



L 



XLIL Observations on the Pendulum Experiment ; by Rev- 

 C. S. Lyman, - -"• 



XLIIL British Association, Twenty -first Meeting at Ipswich, July 2 : 



1. On preparing Speculums for Telescope ; by the Earl of 

 EossE. — 2. On a New Method of determining the quantity of 

 Hygrometric Moisture in the Air ; by Dr. Andrews, — 3. On 

 the cause which maintains Bodies in a Spheroidal State, be- 



• yond the Sphere of Physico-chemical Activity ; by M. Boi;- 



. On Earthquakes ; by Mr. Mallet. — 5. Report 



on the Physical and Economical Effects of the Destruction 



of Tropical Forests in British India ; by Dr. H. Cleghorn. 



6. On the Great Earthquake experienced in Chile, April 



2, 1851, from R. Budge, Esq., to W.' Bollaert, Esq., in a 

 letter dated April 17, with Observations by the latter, 416-426 



TIGNV. 



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SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Laws of Magnetism : Magnetism of Oxygen gas, 427. 

 Molecular structure of organic bases, 428. — On Stibmethyl and its compounds, 

 430. — Selenio-cyanogen and its compounds; Propion: lodid of Nitrogen : Al- 

 cohol of Caprylic acid, 432.— On the new metal Donarium,433. — An account of 

 an apparatus for producing Attrition between the Surfaces of Siliceous Stones in 

 Vacuo, or in Gaseous Media, and for determining whether the consequent Odor 

 and Corruscations are due to Ozonification, by Dk. Har£, 434. 



Botany and Zoology. — Note on the Vegetation of the Coal Period,by J, E.Tesche- 

 MAciiER, 433. — Conspectus Crustaceorum, &c.; Crustacea of the U.S. -Ex- 

 ploring Expedition, by James D. Dana : Mastodon in Northern Illinois, by 

 Prof. S. P.Lathrop, 439. 



Miscellaneous Inielli^cncc. — Great Exhibition in London, 440. — Aurora Borealis, 

 442, — On the Earthquake in Calabria, by E.J. Morris, 443.— Palaeontogruphical 

 Society, 444. — Dr. Krantz's Geological and Mineralogical Specimens ; Gold in 

 Australia: Prize offered by the Royal Prussian Academy at Berlin, 445. 

 Obituary. — Lorenz Oken, 445. — Alexander de Saluzzo : William Nicol : Baroa 

 de Silve3tre : Dr. Konig, 446. 



Bibliography. —JJn'ned States Exploring Expedition during the years 1S38-1842, 

 under the command of Charles Wilkes, U.S.N. ; Meteorology, by Charles 

 WijLKEs, U.S.N., 446.— Outlines of Chemistry for the use of Students, by Wm. 

 Gregory, M.D-: Catalogue of Shells contained in the collection of Dr. Jonrc 



447. — A Synopsis of the Classification of the British Palaeozoic Rocks, 

 by the Rev. Adam Sedgwick; with a detailed Systematic Description of the 

 British Palaeozoic Fossils in the Geological Museum of the University of Cam- 



Monographic des Polpicra Fossiies dc« 



C.J 



bridge, fjy Fkeoerick M*Coy, 44d. 



