TO CORRESPONDENTS. 



We fear that the proposed additions to the Astronomical Clock would 

 be considered too complicated by practical Astronomers. 



Mr. GALBRAITH'S Table for reducing North Polar Distances ; and 

 Mr. EDMONDS'S Notice, in our next. We have been obliged to defer 

 several Articles prepared for insertion, in order to make room for Pro- 

 fessor SEDGWICK'S interesting Address to the Geological Society -, among 

 the rest, the Proceedings of the Royal, Linnasan, Zoological, and other 

 Societies ; and the communications with which we have been favoured from 

 Cambridge^ which we shall gladly insert in our next. 



Mr. CALDCLEUGH requests ns to insert the following corrections of the report 

 of his paper " On the Geology of Juan Fernandez," given in our last. 



" At page 220 of the last Number, I am made to say, that the island of Juan 

 Fernandez was the scene of the fabulous adventures of Robinson Crusoe. The 

 expression used by me in the paper, as read before the Geological Society, is, that 

 Selkirk was the real hero of the romance (and in stating this, T follow the 

 opinions of several coternporaneous literary characters); but I never could suppose 

 that the island in question was the scene of it. 



" A note of interrogation follows the word metastatique (misprinted metastique), 

 which applies to one of the crystalline forms of Carbonate of Lime in common 

 parlance, Dog's Tooth Spar." 



These errors will be corrected in our " Errata" for the volume. 



*** The Editors request that all Communications intended for immediate 

 insertion may be sent to the care of Mr. Richard Taylor, Printing Office, 

 Red Lion Court, Fleet Street, London, at furthest by the I5lh day of the 

 month, or they "will be too late to appear in the ensuing Number. 



UNIVERSITY OF LONDON. 



A COURSE OF TWELVE LECTURES on GEOLOGY, Illustrated 

 by Models, Drawings, and Specimens, will be delivered in the Lon- 

 don University, during the months of April and May, by JOHN PHIL- 

 LIPS, F.G.S. Author of Illustrations of the Geology of Yorkshire, &c. &c. 



This Day is published, in 8vo, Price 4-s. boards, 



THE UTILITY OF THE KNOWLEDGE OF NATURE CON- 

 SIDERED; with reference to the introduction of Instruction in 

 the Physical Sciences into the General Education of Youth : comprising, 

 with many additions, the details of a Public Lecture on that subject, 

 delivered at Hazelwood School, near Birmingham, October 26, 1830. 



By E. W. BRAYLEY, Jun. A.L.S. 



Lecturer on Natural Philosophy and Natural History: 



TEACHER OF THE PHYSICAL SCIENCES IN THE SCHOOLS OF HAZELWOOD 



AND BRUCE CASTLE. 

 Published by Baldwin and Cradock, London ; and J. Drake, Birmingham. 



