Vlll CONTENTS. 



Page 



Geology, which seem to bear most directly on theoretical 

 Speculations (continued) 401 



Mr. R. Phillips's Analysis of a peculiar Submuriate of Iron, 

 and of some other Subsalts , . 406 



Mr. W. Hutton's Notes on the New Red Sandstone of the 

 County of Durham, below the Magnesian Limestone 411 



Prof. Bessel's Additions to the Theory of Eclipses, and the 

 Methods of calculating their Results 417 



Mr. J. Prideaux's Continuation of the Table of Atomic Weights, 

 and Notice of a new Scale of Equivalents . , 423 



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

 of the Peak of TenerifFe on the 23rd and 24th of February 

 1829: with some Remarks on the Geology of that Island.. . 433 



Mr. T. Squire on determining the Longitude by Occultations 

 of the fixed Stars . 442 



Notice of the Arrival of Twenty-six of the Summer Birds of 

 Passage in the Neighbourhood of Carlisle, together with 

 some of the scarcer Species that have been met with in the 

 same Vicinity during the Year 1830; with Observations, &c 444 



New Books : — Reid's Elements of Practical Chemistry 449 



Proceedings of the Astronomical Society 456 



■ Royal Geological Society of Cornwall . . 46 1 



On the Sesquipersulphate of Mercury : by Lieut. W. Hopkins, 

 U.S 463 



On Chloride of Silver : by M. Cavalier 464 



Aurora Borealis — Occupation of Aldebaran by the Moon — Me- 

 teorological Observations 465 



Index 468 



PLATES. 



I. Plate showing the Trigonometrical Position of the Hills of Wens- 

 leydale, Swaledale, and Lunedale, Yorkshire. 

 II. Plate illustrative of Prof. Sedgwick and Mr. Mukchison's Sketch 

 of the Structure of the Austrian Alps. 



ERRATA. 



Page 218, line 24,/o;- doubt read dwell. 



Page 245, line I, for plane read plain. 



Page 285. The first paragraph in this page should read as follows : — 

 " both of reflections and shadows, and some problems in inverse perspec- 

 tive (i. e. the making out the geometric form from the perspective one, as 

 well as the perspective from the geometric form), would be desirable addi- 

 tions. A table of contents, or rather an index, would also improve this 

 Supplement, and will we hope be added to a future edition ; for although 

 the work is divided into chapters," &c. 



