TO CORRESPONDENTS. 



We have been obliged, by great press of matter, again to postpone the 

 insertion of Mr. Nixon's Communication ; Mr. Alison's Ascent to the 

 Peak of Teneriffe ; the conclusion of Mr. De la Beche's Paper ; and the 

 continuation, which we promised in our last, of the controversy between 

 MM. CuviER and Geoffroy-Saint-Hilaire, respecting the Unity of 

 Organization in Animals. 



The Communications which have been received from Mr. Galbraith, 

 Mr. WiTHAM, Mr. Prideaux, Mr. Macvicar, and Mr. S. Sharpe, 

 will receive our early attention. 



Our. Mathematical readers, we apprehend, would not consider the 

 Paper containing a " Remark on the Diophantine Analysis," to be suited 

 to our pages. 



%* The Editors request that all Communications intended/or immediate 

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

 Red Lion Court, Fleet Street, London, at Jurihest by the 1 5th day of the 

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



T 



FRENCH PATENTS. 



^O such Persons interested in New Inventions as may be desirous of 

 taking out Patents for them in France, Mr. PHILIP TAYLOR 

 ofiPers his services in obtaining Brevets d' Invention, including the drawing 

 of Specifications, making Designs, and whatever may be conducive to 

 their advantageous introduction in France. 



Address— Mr. Philip Taylor, Engineer, Rue Violet, No. 12, Cre- 

 nelle, Paris. 



This Day is published, compressed into Two Volumes, 8vo, price 30s. 

 Third Edition, considerably enlarged and improved, with numerous 



Plates, Wood-cuts, Diagrams, &c., 

 A MANUAL of CHEMISTRY, Practical and Theoretical ; con- 

 -*^*- taining an Account of all Recent Investigations and Discoveries. 

 By W. T. BRANDE, F.R.S., Professor of Chemistry at the Royal In- 

 stitution, &c. &c. 

 John Murray, Albeniarle-street. 

 Also, by the same Author, a New Edition, post 8vo, with Plan and 

 illustrative Wood-Cuts, 7s. 6d., OUTLINES of GEOLOGY, for Begin- 

 ners; being the Substance of a Course of Lectures delivered at the Royal 

 Institution. 



