TO CORRESPONDENTS. 



Mr. James Sayer's paper, " On the products of the action 

 of sulphuric acid on alcohol," reached us too late for insertion 

 in this Number, and is therefore disposed of according to his 

 directions. 



The Review, commencing with the proverb " It is an ill wind 

 that blows nobody good," we decline inserting. 



We are much obliged by Mr. John Vaillant's communication 

 on Secret Writing ; and to X. for a letter on the same subject. 



Our medical correspondent at Manchester will find the infor- 

 mation he desires in our last Number, under the head of Foreign 

 Science. 



The Observations on the use of arsenic in the cure of inter- 

 mittent fevers, we think excellent, but too exclusively medical 

 for this Journal ; we will, therefore, either return the MS. to 

 the author, when his address is known, or transmit it to a 

 Medical Journal. 



P + p, Typographus, a letter dated Naples, January 1 , with 

 a signature which we cannot decipher, and " Amicus Scien- 

 tiarum," are under consideration. 



