TABLE OF CONTENTS, 



NUMBER XXXI.— JANUARY. Page 



Mr. J. F. W. Johnston on the Dimorphism of Baryto-calcite. . 1 



Rev. Patrick Keith on the Structure of Animals 4 



Rev. Baden Powell's Abstract of the essential Principles of 

 M. Cauchy's View of the Undulatory Theory, leading to an 

 Explanation of the Dispersion of Light ; with Remarks .... 16 

 Dr. C. J. B. Williams's Observations on the Production and 



Propagation of Sound 25 



Dr. Faraday's Experimental Researches in Electricity. — 



Eighth Series 34« 



Dr. Olbers on the approaching Return of Halley's Comet 45 



Mr. R. Phillips on the Quantity of Water contained in cry- 

 stallized Barytes and Strontia 52 



New Books: — Allan's Manual of Mineralogy, comprehending 



the more recent Discoveries in the Mineral Kingdom 53 



Proceedings of the Royal Society 55 



Geological Society 63 



Zoological Society 68 



Linnaean Society 72 



Cambridge Philosophical Society 73 



Royal Medals to be awarded by the Council of the Royal So- 

 ciety, for the most Important Discoveries and Investigations 



in Science, in the years 1833 and 1837 75 



Mr. W. C. Trevelyan on the Occurrence of Fragments of Gar- 

 net in the Millstone Grit — Mr. H. J. Brooke's Mineralogical 



Notices 76 



On the Juice of Eschscholzia Californica — Herrmann Prick's 



Analysis of Nadelerz 77 



Ammonia in the Vegetable Alkalies , 78 



M. Horace Demar9ay on the Employment of insoluble Salts 



in Analysis 79 



Meteorological Observations made by Mr. Thompson at the 

 Garden of the Horticultural Society at Chiswick, near 

 London, and by Mr. Veall at Boston 80 



NUMBER XXXII.— FEBRUARY. 



Mr.D. Mushet on the Practicability of alloying Iron and Cop- 

 per 81 



Mr. A. Trevelyan's Further Notice of the Vibration of Heated 



a 2 



