TO CORRESPONDENTS. 



The Editor regrets that Mr. G. Mansel*s Paper reached him 

 too late for publication in this Number. 



We presume that our Correspondent J. F. D. allows his 

 communication to stand over till next Number. 



The Letter, signed V., has been received. 



The Editor begs to apologize to Mr. Watts for the term 

 ** illiberal," used in the Index of Volume VIII. of this Journal : 

 it escaped his observation till Mr. W. pointed it out. 



An additional Plate will be given in No. XX. 



The Chemical Lectures and Demonstrations in the Laboratory 

 of the Royal Institution commence on Tuesday, the 10th of 

 October, at nine in the morning : for particulars, see pag« 

 215 of this Number. 



A new edition of Mr. Brande^s Manual of Chemistry, consi- 

 derably enlarged, in 3 volumes, 8vo. is in the press, and will 

 be ready early in the Spring. 



