TO OUR READERS AND CORRESPONDENTS. 



We declined the insertion of the letter signed Omega, in con- 

 sequence of the irrelevant matter wliich it contained ; we shall 

 be happy to receive and publish any temperate observations 

 upon the subject, but they must not be mixed up with bridges and 

 church steeples. 



We are much obliged by the communications from Hull ; but 

 independently of the incorrectness of the drawing, we believe 

 there are better means of attaining the same end. 



The letters from Portsmouth are anonymous. 



Q. E. D. may advantageously consult the Marquis of Worces- 

 ter's " Century of Inventions." 



We cannot at present interfere in the controversy alluded to by 

 a *' Member of the Astronomical Society ;" at all events, we beg 

 leave to postpone the publication of his communication till our en- 

 suing number. 



Z. is correct, as to the low expansive power of Platinum ; it 

 falls far short of that of the other metals ; but its expense and 

 specific gravity are bars to its application in the way he suggests. 



If " A Member of the Mechanics' Institute" will be a little 

 more explicit, we shall be happy to give him all the information 

 in our power. 



Several articles are necessarily postponed till our next Number 

 —we shall then certainly review the work alluded to by Philo- 

 Chemicus, but we cannot promise to adopt his suggestion. 



