IV CONTENTS. 



Page 



Solar Spots — Meteorological Observations 78 



Meteorological Observations made by Mr. Booth at the 

 Garden of the Horticultural Society at Chiswick, near 

 London, by Mr. Giddy at Penzance, Dr. Burney at Gosport, 

 and Mr. Veall at Boston 80 



NUMBER XLIV.— AUGUST. 



Rev. A. Sedgwick and Mr. R. I. Murchison's Sketch of the 

 Structure of the Austrian Alps, &c. &c 81 



Mr. J. Ivory on the Shortest Distance between two Points on 

 the Earth's Surface 1 14 



Prof. Gauss on a new general Principle of Mechanics 117 



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

 Heights of the principal Hills of Swaledale, Yorkshire {con- 

 tinued) 120 



Statement respecting the Discovery of the new Species of 

 Swan, named Cygnus Bevoickii 128 



Mr. A. H. Haworth's Results of an extensive Re -examination 

 of the Narcissean Group of Plants 130 



Mr. W. S. MacLeay on the Dying Struggle of the Dichoto- 

 mous System (continued) 134 



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 {continued) 140 



New Books: — Mr. Moseley's Treatise on Hydrostatics and 

 Hydrodynamics „ 1 45 



Proceedings of the Roj'al Society 146 



Geological Society 147 



Horticultural Society 152 



Notes on Dr. Roget's Reply to Mr. Babbage 153 



Dr. Reade's Lectures on Vision — Reduction of Nitrate of 

 Silver 154 



Magnetizing Power of the Solar Rays — Constitution of Acetic 

 iEther — Percussion Fire- Arms 155 



Meteorological Observations 157 



NUMBER XL V.— SEPTEMBER. 



Mr. J. Prideaux's Table of the Atomic Weights of Simple 

 Bodies, according to Thomson and Berzelius, with a mean 

 Weight deduced, for each Substance 161 



Mr.Yarrell's Reply to the Statement respecting the Discovery 

 of Cygnus Beivickii, published in the Phil. Mag. and Annals 

 for August 167 



Rev. J. Challis's Attempt to explain theoretically the different 

 Refrangibility of the Rays of Light, according to the Hypo- 

 thesis of Undulations 169 



Prof. 



