IV CONTENTS. 



Page 

 Dr. Reade on the Nature of Light and Shadow, demonstrating 

 that a Black Shadow can be rarefied, without Refraction, into 



all the Colours of the Rainbow 109 



Mr. Martin's Observations on the Anticlinal Line of the Lon- 

 don and Hampshire Basins, &c Ill 



Mr. Children's Abstract of the Characters of Ochsenheimer's 



Genera of the Lepidoptera of Europe; &c. {continued). 119 



New Books: — Davenport's Amateur's Perspective 127 



Proceedings of the Royal Society 129 



Geological Society 134? 



Commemoration of Ray 140 



Red Ferrocyanate of Potash 148 



On Gallic Acid, Tannin, and a peculiar Principle in Coffee. . 149 



New Experiments on the Combustion of Coal-Gas 150 



Sanguinaria, a new Vegetable Alkali — Analysis of Rhubarb 



and of the Yew 151 



New Classification of the Colours of the Rainbow 152 



Claw of the Iguanodon — Mr. BJackwall on Luminous Arches 

 of the Aurora Borealis, seen at Manchester on the 1st and 

 26th of December 1828 ; and on that of the 29th of Septem- 

 ber, as seen at Dublin 153 



Proposal for a Repository for Manuscripts 154 



Suggestions to Barometrical Observers 155 



Obituary : — Mr. Thomas Tredgold — New Patents 156 



-Meteorological Observations 158 



• — made by Mr. Booth at the Gar- 

 den of the Horticultural Society at Chiswick, near London, 

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

 Veall at Boston 160 



NUMBER XXVII.— MARCH. 



Messrs. Von Oeynhausen and Von Dechen on the Junction of 

 the Granite and the Killas Rocks in Cornwall 161 



Rev. J. B. Emmett on an Electrical Phaenomenon 170 



Mr. Pattinson on the Action of Steam and Quick-lime upon 

 heated Galena 172 



Mr. Nixon on the Curvature of Spirit-Levels 174 



Rev. W. V. Vernon's Analysis of an aluminous Mineral in the 

 Collection of the Yorkshire Philosophical Society 178 



Reflexions sur un Memoire de M. T. N, Nicollet, insere dans 

 la Connaissance des Terns pour I'An 1831, " Sur un Nouveau 

 Calcul des Latitudes de Mont-Jouy et de Barcelone, pour 

 servir de Supplement au Traite de la Base du Systeme Me- 

 trique " ISO 



Mr. Children's Abstract of the Characters of Ochsenheimer's 

 Genera of the Lepidoptera of Europe ; &c. {continued).... 188 



A Table of the Arrival of some of the Summer Birds of Passage 

 in the Neighbourhood of Carlisle, during the Years 1827 and 



1828; with Observations, &c 196 



Mr. 



