TO OUR READERS AND CORRESPONDENTS. 



We are under the necessity of postponing; two Communications, with 

 which we have been favoured by Mr. James Adams. 



An extension of the demonstration of the Taylorian Theorem, published 

 in this number, to functions of several variables, will appear in our next 

 number. 



Mr. Adic's Sympiesometer, is not an instrument of sufficient import- 

 ance to induce us to engrave Mr. Prinsep's corrected scale. 



We have received a paper " on the Use of the Pocket box Sextant," 

 which reached us too late for this number. 



Mr. Levy's observations on the crystalline forms of artificial salts will 

 be resumed in our next. 



Our Correspondent at Penzance has omitted the sketch which should 

 have accompanied his communication. 



" Amicus Cantabrigiensis," is under consideration. 



The enormous expense attendant on printing extensive tables, obliges 

 us to decline the insertion of Mr. Wilmot's very interesting, paper on the 

 Population, $-c, of London. We particularly request our Astronomical 

 and Meteorological Correspondents to take the above consideration into 

 account. 



X. will be so good to inform us to whom we are to return his " Stric- 

 tures," on the proposed London Bridge. The considerations which he 

 suggests, have no influence with us ; but his remarks will not find a place 

 in this Journal, till he can persuade us that invective is argument, and 

 personal abuse, candid criticism. 



We have received an anonymous article on the proposed " Tunnel 

 under the River Thames," which we decline publishing, as the writer is 

 evidently unacquainted with the means by which the undertaking is in- 

 tended to be accomplished. With him, we greatly doubt its practicability ; 

 and, if practicable, its permanance and utility, are still very questionable. 



The queries of F. R. S., respecting Mr. Perkins' steam-engine, we 

 have no means of answering. 



