iv CONTENTS. 



Page 



NUMBER XIV.— AUGUST. 



Mr. H. F. Talbot's Proposed Philosophical Experiments 81 



Mr. J. Bryce's List of the Simple Minerals of the Counties of 

 Down, Antrim, and Derry 83 



Mr. G. H. Fielding on certain Changes of Colour, induced by 

 chemical and other Agents, in the Membrane lining the 

 Choroid Coat of the Eye ; in Reply to an Editorial Note in 

 Lond. and Edin. Phil. Mag. and Journal, vol. i. p. 115 87 



Mr. J. Davies's Attempt to assign the Cause of the Sponta- 

 neous Combustion of Charcoal. 89 



Mr. N. J. Winch's Contributions to the Geology of Northum- 

 berland and Durham (continued) 92 



Mr. B. Bevan's Table of the First, Second, and Third Powers 

 of the Sines to Centesimal Parts of the Versed Sine 99 



Rev. T. J. Hussey's Catalogue of Comets (continued) 101 



Mr. C. T. Beek's Remarks on Mr. Drummond Hay's Observa- 

 tions on the Gopher-wood of the received Version of the 

 Scriptures 103 



Mr. J. Blackwall's Characters of some undescribed Genera 

 and Species of Araneidce 104 



Rev. W. D. Conybeare on the alleged Discovery of Coal at 

 Billesdon, Leicestershire 112 



Mr. J. MacCullagh's Note on the Subject of Conical Refrac- 

 tion 114 



Dr. S. L. Dana on the Manufacture of Sulphuric Acid, and 

 on the White Crystalline Substance which is formed during 

 that Process 115 



Rev. W. Ritchie on the Power of an Electro-Magnet to re- 

 tain its Magnetism after the Battery has been removed. ... 122 



— on certain curious Properties of Common and 



Electro-Magnets 124 



Mr. R. Phillips on Minium 125 



New Books : — Report of the First and Second Meetings of the 

 British Association for the Advancement of Science ; at 

 York in 1831, and at Oxford in 1832; including its Pro- 

 ceedings, Recommendations, and Transactions ; — Dr. Pear- 

 son's Introduction to Practical Astronomy 129 



Proceedings of the Royal Society 141 



Zoological Society 148 



Proceedings of the British Association for the Advancement 

 of Science at the recent Meeting at Cambridge 151 



Mr. R. Phillips's Analysis of two Sulphureous Springs near 

 Weymouth 1,58 



Elastic Fluids evolved from Volcanos — Lunar Occultations 

 for September and October 1 59 



Meteorological Observations 160 



