294! Intelligeiice and Miscellaneous Articles. 



C38 2850 



H4* 275 



N* 350 



O^ 400 



3875 



Cinchonia. — M. Liebig represents cinchonia by C'oH-^N^ O, and 

 M. Regnault by C-o H'" N- O, or rather by double. M. Laurent's 

 analysis gives — 



C33 2850 



H« 275 



N* 350 



O"- 200 * 



It appears therefore that cinchonia differs from quina in containing 

 only half as much oxygen. 



The author concludes by giving the following formulae as the 

 results of his analysis : — 



Quina C'='H="-N"-02 



Cinchonia C>" H"-'^ N"- O 



Morphia C" H'3 NQs 



Quinoleina C" H' N 



Lophia C« H16 N"- 



Picryle C^iR'^NO^ 



Narcotina C« H'^s nO^ 



Cotarnina C'"-H'3N03 



Narcogenina C's H'^'NO* 



Opianicacid C'oH'oO^ 



Opianate of ammonia C'° H'^ NO^ 



Hemipinic acid 0'° H'" 0^ 



Hemipinate of ammonia C'° H'^ N- O^ 



Starch C'"-H'200'° 



Pyroxyline C'"- H>7 N* O" 



Conina C^NH'^ 



Ann. de Ch. et de Phys., Mars 1847. 



ON THE CHANGE EFFECTED IN HYDRATED PEROXIDE OF IRON 

 WHEN KEPT IN WATER. BY M. G. C. WITTSTEIN. 

 It is well known that a solution of persulphate or perchloride 

 of iron gives a reddish-brown precipitate with ammonia, and it is 

 flocculent and very bulky : its formula is Fe-03 + 3HO, and it dis- 

 solves perfectly in cold acetic acid. It does not Iiovvever appear to 

 be known, that this precipitate, when kept under water, and without 

 having been previously dried, almost entirely loses its property of 

 dissolving in acetic acid, as if it had been dried. Some other organic 

 acids, which readily and completely dissolve recently-precipitated 

 peroxide of iron, such as tartaric and citric acids, &c., also dissolve 

 a much smaller quantity of tbe oxide which has been long kept under 

 water. M. Wittstein states that some researches which he has made 

 on this subject Iiavc afforded him very satisfactory results. 



