Vlll CONTENTS OF VOL. XXVIII. — THIRD SERIES. 



Page 



The Astronomer Royal's Remarks on Dr. Faraday's Paper on 



Ray-vibrations 532 



Mr. R. Mallet's Explanation of the Vorticose Movement, as- 

 sumed to accompany Earthquakes 537 



Prof. E. Wartmann on the Causes to which Musical Sounds 

 produced in Metals by discontinuous Electric Currents are 



attributable 544 



Mr. E. F. Teschemacher's Account of various Substances found 



in the Guano Deposits and in their Vicinity 546 



Dr. Gregory's Notes on the Preparation of Alloxan 550 



On Chloroazotic Acid 555 



Notices of New Localities of Rare Minerals, and Reasons for 



uniting several supposed Distinct Species, by Francis Alger. 557 

 Notice on certain Impurities in Commercial Sulphate of Copper, 



by Mr. S. Piesse 565 



On a New Eudiometric Process, by Prof. Graham 566 



Equivalent of Chlorine 566 



On Hippuric Acid, Benzoic Acid, and the Sugar of Gelatine. . 567 

 Comparative Analyses of Oriental Jade and Tremolite, by M. 



Damour 568 



Meteorological Observations for April 1846 569 



Table 570 



Index 571 



PLATES. 



I. Illustrative of Lieut.-Col. Sabine's paper on the Meteorology of 

 Bombay. 



II. Illustrative of Mr. Hunt's paper on the Influence of Magnetism on 

 Molecular Arrangement. 



III. Illustrative of Dr. Waller's paper on the Molecular Actions of Cry- 

 stalline Particles. — Mr. Collen's paper on the Application of Photo- 

 graphy to Meteorological Registration. 



IV. 

 V. 



VI. Illustrative of Mr. Brown's paper on the Meteorological Phaeno- 

 VII. f mena of November 1842. 

 VIII. 

 IX. 



Errata and Addenda. 



Page 190, Note **, between " 3." and "p." add vol. xxvii. 

 ... 391, for Salis deliquio read Solis. 



, for Bontschii read Bartschii. 



... 393, for Sagincnsibus read Saganeniibus. 



