TABLE OF CONTENTS. 



NUMBER XIX.— JULY. p 



Mr. Haidinger on Herderite, a new Mineral Species 1 



Reply of Drs. Tiedemann and Gmelin to the Remarks of Dr. 

 Prout inserted in the Annals of Philosophy (Second Series), 



vol. xii. p. 405 : Communicated by Dr. T. Thomson 3 



Mr. Ivory on the Latitudes and Difference of Longitude of 

 Beachy Head and Dunnose in the Isle of Wight, as laid 

 down in the Trigonometrical Survey of England ; and the 

 Length of a Degree perpendicular to the Meridian at the 



Latitude of Beachy Head 6 



Mr. Walker's Additional Remarks on the Artificial Production 



of Cold 11 



Observations on the Geology of the Hyderabad Country .... 12 



Mr. Sharpe on the Figure of the Cells of the Honeycomb 19 



Dr.Turner's Chemical Examination of the Oxides of Manganese 



{continued) 22 



Dr. Green's Experiments on the Pressure of the Sea, at consi- 

 derable Depths . . 36 



New Books : — Mr. Martin's Geological Memoir on a Part of 



Western Sussex ; — Fife's Elements of Chemistry 38 — 55 



Proceedings of the Royal Society 55 



•' Linnaean Society 61 



1 1 ■ Astronomical Society 62 



at the Friday Evening Meetings of the Royal 



Institution of Great Britain 64? 



Direct Method of ascertaining the Velocity of Cannon-Balls. . 65 

 Chrysolite in the Cavities of Obsidian — Meteor of a Green 



Colour — Bitter of Aloes : Carbazotic Acid 66 



Heat developed during Combustion — On the Sugar of Liquo- 

 rice Root 67 



Solution in Sulphuric Acid without Oxidizement 68 



Vegetable Albumen and Gelatine 69 



Anhydrous Crystals of Sulphate of Soda— Caseous Oxide, and 



Caseic Acid 71 



Rib of a Whale found in the Diluvium of Brighton Cliffs 72 



Inequality of the Dark Space between the Body of Saturn and 



its Ring — Native Iron ? slightly arseniuretted 73 



Arseniate of Cobalt 75 



Solar Spots, &c. — New Patents 76 



Meteorological Observations 78 



made at the Garden of the Horti- 

 cultural Society at Chiswick, near London, by Mr. Giddy at 

 Penzance, Dr. Burney at Gosport, and Mr. Veall at Boston 80 



NUMBER XX.— AUGUST. 



M. A. Brongniart on Websterite found in the Plastic Clay of 

 Auteuil, near Paris . , , , , . , 81 



Sir 



