The Conductors of the London and Edinburgh Philoso- 

 phical Magazine and Journal of Science beg to acknowledge 

 the editorial assistance rendered them by their friend Mr. 

 Edward William Brayley, F.L. & G.S., Librarian to the 

 London Institution; which commenced in the year 1823, in 

 vol. lxi. of the First Series, and has been regularly conti- 

 nued from that time. 



December 1st, 1835 



