14.4 Aerial Navi^alion. 



J. Acheson, Esq. J. Tardy, Esq. 



Col. Rochfoit. ' M. J. d'Kelly, Esq. 

 C. Williams, Esq. C. Croker, Esq. 



B. Blood, Esq. M.R.I. A. R. Graves, Esq. 

 T. Nugent, Esq. Hill Cleinencs,Esq. 



J. Brown, M.D. E. Stephens, Esq. 



J.Sealy, Esq. L. Wall, M.D. 



XXXIX. Intelligence and Miscellaneous Articles. 



AERIAL NAVIGATION. 



T 



Xn consequence of Sir George Cayley's commnnication, inserter 



in our number for May, we have been favoured with a letter fror. 

 a gentleman of distinguished literary and scientific reputation.. 

 He is " inclined to believe that something useful to mankind on , 

 the subject may be either positively or negatively ascertained, 

 under the conduct of men of science." He is willing to con- 

 tribute fifty pounds for furthering any plan which may obtain the] 

 sanction of a few men of the description to which he alludes. 



Sir George Cayley has requested us to correct an error in the 

 title prefixed to his last article, in which F.R.S. was affixed to 

 his name bv mistnke. Tlie fact was simply this: The Editor, 

 who was obliged to leave town for a few days, sent the commu- 

 nication without any title, along with some other articles to the 

 printer to |iut to press in his absence ; and trusting to memory 

 instead of lookint? at Sir George's previous communication, the 

 printer committed the error complained of. 



COURESPONDENCE OF M. VAN Mt)NS, CONTINUED*. 



Brusbtlls, Jirlv 1816. 



I have of late paid particular attention to the manner in which 

 the solutions of salts are decomposed by reduced metaLs. We 

 see a liquor thicker than water, separated from the solution and 

 approach the metal : then it disappears, and at the same instant 

 the reduced metal shows itself in a state as if it had undergone 

 fusion. It is not to be supposed that the acid quits for some 

 time the oxide, to admit of the latter taking up the oxygen by 

 the decomposing metal ; for this would be granting too much ; 

 and besides, the solution reacts at no period on the blue colour 

 with which we stain it. We ought rather to conceive that tht? 



* In the translation of tlie letter of M, Van Mons, given in our number 

 for March, pp. UH and 2 15, the muriate of lead of Dtrbysliire is said td 

 consist of lead and '■' i)ltjiphoric acid;" the latter ought to have liccn 

 "plws^en acid." 



water 



