Intelligence and Miscellaneous Articles. 385 



Mr. Hope's request he had made a minute analysis of these gums, 

 an account of which he detailed, adding that he had obtained very 

 valuable practical results, in operating on these substances, by the 

 application of the new aethereal essence of caoutchouc. 

 A lengthened discussion terminated the proceedings. 



LXIII. Intelligence a?id Miscellaneous Articles. 



CHLOROCARBONIC ACID. 



M DUMAS finds that this acid is best formed in a diffused 

 • rather than a vivid light : when mixed with anhydrous 

 alcohol it yields an aether, in which an atom of chlorine is replaced 

 by an atom of oxygen. 



The aether put in contact with ammonia, yields a compound which 

 crystallizes very readily, and offers a case of isomerism with lactate 

 of ammonia, and also presents the composition of ammonia com- 

 bined with sugar. 



Oxalic aether gave with ammonia a compound which may be re- 

 presented by alcohol and oxamide, and from which this last sub- 

 stance maybe extracted. — Journal de Chimie Medicale, Feb. 1834. 



PYROGENOUS ACIDS. 



M. Pelouze announces that he has discovered a general law, ap- 

 plicable to all pyrogenous acids (acides pyrogenes) which do not 

 contain azote. 



This law is thus expressed : A pyrogenous acid being given, this 

 acid + a certain quantity of water and of carbonic acid, or only one 

 of these bodies, always represents the organic matter from which it 

 is derived. 



Thus, gallic acid exposed in a retort to 410° Fahr. is entirely con. 

 verted into pyrogallic acid and carbonic acid, totally absorbable by 

 solution of potash, and these two products are exactly equivalent to 

 the acid employed, at the temperature of 482° Fahr., the results of 

 the decomposition being then equivalent to metagallic acid, carbonic 

 acid and water. 



M. Robiquet had discovered that by distilling meconic acid at 

 410° Fahr. metameconic and carbonic acids, together representing 

 meconic acid, were obtained ; and that at 482° Fahr. he procured 

 pyromeconic acid and carbonic acid. 



M. Dumas obtained, by the distillation of citric acid, pyrocitric 

 acid and water, with scarcely a trace of charcoal. 



When the volatility of an acid prevents the above-described de- 

 composition, it may be effected by combining it with a base. For 

 example, by saturating acetic acid with barytes, carbonic acid re- 

 mains combined with the barytes in the residue, and pyroacetic 

 spirit is distilled. 



M. Bussy, by distilling margaric and stearic acids in contact with 

 lime, obtained new substances, the composition of which accords 

 with the preceding law. 



M.G. de Claubry has observed that the decomposition of several 

 Third Series. Vol. 4. No. 23. May 1834. 3 D 



