CONTENTS. 



NUiMBER LI.— JULY, 1836. 



Page 

 Mr. H. F. Talbot's Facts relating to Optical Science, No. III. 1 

 Dr. H. S. Boase's Remarks on Mr. Hopkins's " Researches in 



Physical Geology" 4- 



Rev. E. Craig's Remarks on Microscopic Chemistry 10 



Notice of the Harvest-bug 15 



Dr. H. Johnson on the Divergence of Plants, and its Analogy 



to the Irritability of Animals 17 



Mr.W. S. B. Woolhouse on the Theory of Vanishing Fractions, 



in reply to Professor Young 18 



Prof. T. Graham on the Water of Crystallization of Soda-alum 26, 

 Prof. Sir W. R. Hamilton's Second Theorem of Algebraic Eli- 

 mination, connected with the Question of the Possibility of 

 resolving, in finite Terms, Equations of the Fifth Degree .. 28 

 Dr. D. E. Riippells Observations on the FossilGenera Pseudam- 

 monites and Ichthyosiagoiiites of the Solenhofen Limestone, 



contained in a Letter to R. I. Murchison, Esq 32 



Mr. C. T. Beke on the former Extent of the Persian Gulf, and 

 on the Non-identity of Babylon and Babel ; in Reply to Mr. 



Carter (^concluded) 34; 



Letter from Baron von Humboldt to His Royal Highness the 

 Duke of Sussex, K. G., President of the Royal Society of 

 London, on the Advancement of the Knowledge of Terre- 

 strial Magnetism, by the Establishment of Magnetic Sta- 

 tions and corresponding Observations 42 



Prof. Schoenbein of Hale on a peculiar Voltaic Condition of 

 Iron; in a Letter to Mr. Faraday: with further Experi- 

 ments on the same Subject, by Mr. Faraday ; communicated 



in a Letter to Mr. Phillips 53 



Notice of the Magnetic Action of Manganese at low Tempera- 

 tures, as stated by M. Berthier ; in a Letter from Mr. Fara- 

 day 65 



Proceedings of the Zoological Society 66 



at the Meetings of the Royal Institution 71 



Cambridge Philosophical Society 71 



On the feeble Attraction of the Electro-magnet for small Par- 

 ticles of Iron at short Distances 72 



Observations on the Solar Eclipse of May 15, 1836; and on 



the Aurora Borealis of April 22 73 



British Association for the Advancement of Science 74 



Meteors observed in India in 1832 74. 



M. Dufresnoy's Analysis of Plombgomme 75 



On the Action of iodine on Organic Salifiable Bases 76 



On a New Mode of Analysis o( closely aggregated Minerals... 76 

 On some New Combinations of Carbohydrogcn or Methylene 77 



On the Periodidc of Iron 79 



a 2 



