226 Royal Society :— 



Mean of two analyses. 



Carbon 82-44 82-39 



Hydrogen 11-45 11*38 



Oxygen 6-11 623 



The authors, by acting with chloride of benzoyle on sycocerylic 

 alcohol, obtained the corresponding benzoate of sycoceryle ; and by 

 employing chloride of othyle (acetyle), have prepared the acetate of 

 sycoceryle which was identical with the original crystalline constituent 

 of the resin. 



By treating sycocerylic alcohol with nitric acid, an acid was pro- 

 cured which appears to be sycocerylic acid. 



The products of the action of chromic acid on sycocerylic alcohol, 

 were a white crystalline neutral substance and a body crystallizing 

 in large flat prisms. The latter appears to be the sycocerylic 

 aldehyde. 



"Analytical and Synthetical Attempts to ascertain the cause of the 

 differences of Electric Conductivity discovered in Wires of nearly pure 

 Copper." By Professor William Thomson, F.R.S. 



"On a new Method of Substitution; and on the formation of 

 Iodobenzoic, Iodotoluylic, and Iodoanisic Acids." By P. Griess, Esq. 



In a previous notice* I have pointed out the existence of a new class 

 of nitrogenous acids which are generated by the action of nitrous 

 acid on the amidic acids of the benzoic group, the change consisting 

 in the substitution of one equivalent of nitrogen for three equivalents 

 of hvdrogen in two molecules of the amidic acid. 



C 29 H u N 2 8 + N0 3 =3HO + C 28 H n N 3 8 



Two eqs. beuzamic New acid, 



acid. 



Under the influence of various agents these new acids undergo 

 remarkable changes, amongst which the transformation produced by 

 the mineral acids deserves to be particularly noticed. If the acid 

 C M H n N 3 8 be gently heated with strong hydrochloric acid, nitrogen 

 gas is evolved, the yellow colour of the original acid disappears, and a 

 red body separates, which may be separated by filtration and purified 

 by treatment with animal charcoal. Both the physical properties 

 and the analysis of the substance thus obtained, prove it to be pure 

 chlorobenzoic acid. The hydrochloric mother-liquor on evaporation 

 deposits crystals of the hydrochlorate of benzamic acid. 

 C M H n N3 8 -f2HCl=C u (H 5 Cl)0 4 + C 14 (H 6 H a N)0 4 ,HCH-N 2 . 



To render intelligible this transformation, the acid C 28 H u N 3 8 

 may be viewed as a double acid corresponding to two molecules of 

 water, 



C u (H 3 N' a )0 2 "1 



C l4 (H 4 H 2 N) 2 ^0 4 =C 14 (H 4 N' a ) 4 



+ C l4 (H 5 H 2 N)0 4 , 



and splitting under the influence of hydrochloric acid into the two 

 * Phil. Mag. vol. xvii. p. 370. 



