13 



It is probable that this reaction would produce the naphthalamine 

 term, corresponding to anilocyanic and cyanic acid. 



Cyanic acid C 2 H NO 3 



Anilocyanic acid C, 4 H 6 NO 2 



Naphthocyanic acid C a2 H 8 NO 2 



Menaphthoximide, when heated, yields, in fact, a vapour of a most 

 penetrating organic odour ; but Mr. Perkin has not yet obtained 

 sufficient material for a more minute examination of the body to 

 which it belongs. 



January 24,, 1856. 

 Sir BENJAMIN BRODIE, Bart., V.P., in the Chair. 



A paper was in part read, entitled "Account of Pendu- 

 lum Experiments undertaken in the Harton Colliery for 

 the purpose of determining the Mean Density of the 

 Earth." By G. B. AIRY, Esq., Astronomer Eoyal. Re- 

 ceived December 26, 1855. 



i 



January 31, 1856. 

 The LORD WROTTESLEY, President, in the Chair. 



The reading of Mr. AIRY'S paper, entitled " Account of 

 Pendulum Experiments undertaken in the Harton Colliery 

 for the purpose of determining the Mean Density of the 

 Earth/' was resumed and concluded. 



(Abstract.) 



In the first section of this paper, the author explains the reasons, 

 founded on calculation, which appeared to make it probable that 

 the comparison of gravity at the top and the bottom of a mine 



