MOLECULAR THEORY OF ORGANIC COMPOUNDS. 735 



Of the oil of spiraea or salicylous acid, which is isomeric with 



MO T-F O CM 



the last, ^^; of chlorosalicylous acid, - i ; and of hy- 

 C 14 H ^14" 



drated salicylic acid, ^6 or ^&L^. 

 C 14 H C 14 . H 



The peculiarity of oil of spiraea, or salicylous acid, is that its 

 single basic cftom of hydrogen is removeable by itself, like that 

 of a hydrogen acid, in the formation of salts, while of hydrated 

 ben zoic acid, both H and O are removed in the formation of 

 saltSc This difference is expressed in their molecular formulae. 



The hydrated and bibasic bromobenzoic acid is an association 

 of two acids, one of which differs from the other in having an 

 atom of hydrogen replaced by bromine ; namely HO + C 14 H 5 O 4 

 and HO + C 14 H 4 BrO 4 . Of these two the molecular formulae 



may be, of the first, ^ 5 *'ffand of the second H 



. ti C 14 . 



3 

 C 14 H C 14 . H 



Ql benz amide, Bz + Ad, or C 14 H 5 O 2 + NH 2 , the molecular 



formula may be -5" ' ^, in which N replaces 3O of hydrated 

 C 14 H 2 



benzoic acid. 



Of hydrobenzamide, C 14 H 6 N-*, produced by the action of 

 ammonia on the hydruret of benzoyl, the molecular formula is 



s * ; or that of the oil, with 2O replaced by N$. 



^14 



Of salicylimide, HO+C 14 H 5 ON4, produced by the action of 



ammonia on salicylous acid, H 52 N J 3 or H 5 NjO.Q . 



C 14 H 

 salicylous acid with 2O replaced by 



Of cMorosalicylimide, C 14 H 3 CLO 2 N-j, ^^ or 



C 14 H 



3 n i* * > t ^ iree a toms of the chlorous hydrogen of salicyli- 

 C 14 ht 



mide being replaced by chlorine. 



Formation of acids. The formula of benzole or benziri, is 



T iL; of the neutral body, sulphobenzide, ^^2, or ^ Q 2- 



C 12 , C 12 C 12 S 



To the last hydrated sulphuric acid is attached, in suJphobenzic 

 acW _H.O,.0 8 .0 or H t SO r O,.Q 



- C^^TH' ~c, 2 .s.tr 



Sulphurous acid, SO 2 , is a body like sulphobenzide ; in hy- 



