CONTENTS. V 



Page 



Prof. Noggerath on the Magnetic Polarity of two Rocks of 

 Basalt near Niirburg in the Eifel, with some Observations 

 on the Extension of Basalt in that District ; drawn up from 

 the Observations of Bergmeister Schulze of Diiren 174? 



Dr. E. Turner on the Composition of Chloride of Barium .... 180 



Mr. J. Nixon on the Measurement (by Trigonometry) of the 

 Heights of the principal Hills of Swaledale, Yorkshire .... 188 



Mr. R.E.Alison's Narrative of an Excursion to the Summit of 

 the Peak of Teneriffe on the 23rd and 24-th of February 1829 

 [continued) 195 



Mr. W. S. MacLeay on the Dying Struggle of the Dichotomous 

 System 200 



Mr. De la Beche's Notes on the Geographical Distribution of 

 Organic Remains contained in the Oolitic Series of the Great 

 London and Paris Basin, and in the same Series of the South 

 of France 208 



Mr. H. Meikle on the CEconomy of the Steam-Engine, and on 

 some very general Mistakes regarding the Expansions of 

 MM. Dulong and Petit. 213 



Letter from the Rev. W. D. Conybeare on Mr. Lyell's " Prin- 

 ciples of Geology" 215 



Proceedings of the Royal Academy of Sciences of Paris .... 219 



• South African Institution 222 



Alteration of Colour in Wood by Oxygen — Durability of Stones 224? 



Preparation of Bromine and its Hydrate — Detection of Iodine 225 



Action of Alkalies on Organic Bodies — Fresh Discovery of the 

 Chromate of Iron in Shetland — On Ulmin (Ulmic Acid) and 

 Azulmic Acid 226 



New Process for obtaining Lithia — Analysis of a Biliary Cal- 

 culus — On powdering Phosphorus — Formic Acid 228 



Bi-iodate and Tri-iodate of Potash — Power of Metallic Rods or 

 Wires to decompose Water after their Connection with the 

 Galvanic Pile is broken 229 



Detection of Alloy in Silver by the Magnetic Needle 230 



Royal Annual Grant to Sir J. South for the Promotion of 



Astronomy 23 1 



Tribute of Respect to Baron Cuvier — Scientific Books. . ... . . 232 



The Mineral Springs of Caldas da Raynha 233 



Occupation of Aldebaran by the Moon 234 



The Planet Mercury — New Patents 235 



Meteorological Observations 238 



NUMBER XLVL— OCTOBER. 



Mr. W. Galbraith's further Observations on the Obliquity of 

 the Ecliptic 241 



Mr. T. Squire on the Occultation of Aldebaran on July 1 6th, 

 1830; and on the Accuracy of the Computed Times of it 



giyen in certain Almanacks 245 



Mr. 



