IV CONTENTS. 



Page 

 Sir David Brewster oi\ the Luminous Bands in the Spectra of various 



Flames 15 



Mr. II. Fox Talbot on the Improvement of the Telescope 16 



Mr. John Goodman on the Theory of Magnetism 17 



on the Cause of Dissimilarity of the Voltaic and Ordi- 

 nary Electricities 18 



Rev. C. J. Kennedy on the Positive and the Negative Streams of Electrified 



Air, and on an Electrical Machine fitted for examining them 19 



Rev. W. Scoresby on Improved Magnets, and the different Modes of deter- 

 mining their Powers, with an Account of certain undescribed Phenomena in 



Permanent Magnetics 19 



Mr. J. S. Russell's Supplementary Report of a Committee on Waves 19 



Mr. William Walker's Observations on Oceanic Waves 21 



Mr. Rook on the Tidal Phenomena in the Bav of Fundy and the River de la 



Plata '. 22 



Colonel Sykes on the Meteorology of the Province of Coorg, in the Western 



Ghats of India 22 



Mr. Luke Howard on a Cycle of Eighteen Years in Atmospherical Phse- 



nomena. Accompanied by a Chart 24 



Mr. John Prichard's Meteorological Register for 1841-42, from Diurnal Ob- 

 servations taken at Beddgelert in the County of Carnarvon 25 



Mr. Thomas Hopkins on the Meteorology of the Northern Atlantic, the 



South-west Monsoon of India, and places adjacent 26 



on a Meteorological Chart 26 



Mr. James Nasmyth on the Application of the Law of Definite Proportions to 



the Stratification of Clouds 26 



Mr. Henry Fairbairn on the Changes in the Climate of England 26 



Sir John Robison on a new Optical Instrument 27 



Professor Stefano Marianini's Abstract of an unpublished Memoir upon the 

 Magnetizing Action of Transitory Electric Currents, in which it is proposed 

 to explain the Variations in Magnetic Susceptibility which are frequently ob- 

 served in Iron as often as it has been magnetized 27 



CHEMISTRY. 



Professor Schonbein on the Electrolysing Power of a simple Voltaic Circle... 30 



Mr. J. P. Joule on the Electric Origin of the Heat of Combustion 31 



Professor Powell on Apparatus for applying Circular Polarization to Chemi- 

 cal Inquiries 32 



Mr. Mercer on some peculiar instances of (so-called) Catalytic Action 32 



Professor O. L. Erdmann on Hematoxylin, the Colouring Principle of Log- 

 wood 33 



Dr. C. Bromeis on the Formation of Cyanuret of Potassium in a Blast Fur- 

 nace 34 



on the Compounds of Carbon and Iron 34 



Professor Bunsen on Kakodylic Acid and the Sulphurets of Kakodyl 35 



Dr. Lyon Playfair on some New Oxides of certain of the Metals of the Mag- 



nesian Family 35 



's Note on the Composition and Characters of Carvo- 



phyllin '.... 36 



Mr. Richardson's Contributions to the History of the Magnesian Limestones 37 

 Dr. Daubeny on the Agricultural Importance of ascertaining the minute por- 

 tions of Matter derived from Organic Sources that may be preserved in the 

 Surface Soil, and on the Chemical means by which its presence may be 



detected 37 



on the Causes of the Irregularities of Surface which are ob- 

 servable in certain parts of the Magnesian Limestone Formations of this 



Country 39 



Mr. Leigh on a new Product obtained from Coal Naphtha 39 



Professor Haidinger's Account of the Mineralogical and Geological Museum 

 of the Imperial Mining Department of Vienna 39 



