ANIMAL ACIDS DESTITUTE OF AZOTE. 

 SECTION XIII. OF AZELAIC ACID. 



This acid, like the three preceding, was discovered by Lau- 

 rent ; but he procured it only in small quantity, and probably 

 not pure. It was obtained, like the preceding, from the liquid 

 formed by digesting oleic acid in nitric acid. The suberic acid, 

 obtained by the method described in a former section, was agi- 

 tated with ether, which dissolved the azelaic acid. The ether was 

 evaporated, and the residue left in contact with cold ether, and 

 this ether was again evaporated. This process was repeated. 

 What remained was azoleic acid. It constituted an opaque mass, 

 in which small radiated spheres may with difficulty be distinguish- 

 ed. 



Azelate of ammonia does not precipitate chlorides of barium, 

 strontium, and magnesium, not even though alcohol be poured 

 into the mixture. Concentrated chloride of calcium gives a pre- 

 cipitate ; but if that salt be dilute, no precipitation takes place. 

 The salts of lead, silver, and mercury are precipitated white. 

 According to the analysis of Laurent, the constitution of this 

 acid is represented by this formula, C 10 H 8 O 4 + H O = 13-625.* 



SECTION XIV. OF AZOLEIC ACID. 



This acid was also discovered by Laurent, and is one of the 

 products of the action of nitric acid on oleic acid. It was ob- 

 tained from the oil swimming on the surface of the nitric acid, 

 which amounted to about a fifth of the oil originally employed. 



This oil was converted into an ether by mixing it with alcohol 

 and sulphuric acid, and distilling off a certain portion. If we 

 distil the whole, the ether is decomposed. The ether was de- 

 composed by an alcoholic solution of potash. The potash being 

 now neutralized by muriatic acid, the azoleic acid separated. It 

 is liquid and insoluble in water. Laurent analyzed it, (suppos- 

 ing it to contain four atoms oxygen,) and gives the following for- 

 mula for its constitution : C 13 H 13 O 4 - 15-375. f 



This acid has been but very imperfectly examined. M. Bro- 

 meis has promised us a set of experiments on it and the azelaic 

 acid. 



SECTION XV.- OF LJTHOFELLIC ACID. 



This acid was discovered by M. GoebelJ of Dorpat, in a sup- 



* Laurent, Ann. de China, et de Phys. Ixvi. 172. f 



Ann. der Pharra. xxxix. 237. 



