ADIPIC ACID. 19 



Bromeis obtained 



Carbon, . 49-56 



Hydrogen, . 7 -06 



Oxygen, . 43-38 



100-00 



And the analysis of the pimelate of silver gave him 

 Carbon, . 21-98 

 Hydrogen, . 2-64 

 Oxygen, . 13-13 

 Oxide of silver, 62-25 



100. 



From these analyses the following formula may be deduced, 

 C 7 H 5 O 3 + HO = 10. For 



7 atoms carbon 5*25 or per cent 52-5 

 6 atoms hydrogen = 0*75 7.5 



4 atoms oxygen = 4*00 40-0 



10-00 100- 



SECTION XI. OF ADIPIC ACID. 



This acid, like the preceding, was discovered by Laurent* 

 The mother water from which the pimelic acid had been obtain- 

 ed was freed as much as possible from nitric acid by evapora- 

 tion, taking care not to evaporate too far, otherwise the whole 

 mass is decomposed violently and becomes black. We must 

 therefore, after a cautious evaporation, let the solution crystal- 

 lize for two or three days. Draw off the liquid portion by a 

 sucker, and wash the crystals with a little cold water. These 

 evaporations and crystallizations must be repeated till the liquid 

 ceases to deposit any more crystals. The crystals are dissolved 

 in water and again crystallized. They constitute a mixture of 

 adipic and lipic acids. To separate them, the crystals are dried 

 and then dissolved in ether by the assistance of heat The solu- 

 tion is left to spontaneous evaporation till it is reduced to one- 

 half. The portion remaining liquid is decanted off the crystals 

 deposited and evaporated. The two products thus obtained from 



* Ann. de China, et de Phys. Ixvi. 166. 



