466 On the Decomposition of Cuminate of Amnwnia by Heat. 



From these results the following per-centages were ob- 

 tained : — 



I. II. 



Carbon . . . 50*36 50-43 



Hydrogen . . 4*00 3-78 



corresponding to the formula 0^4 Hg Ng Og, as may be seen 

 from the comparison of the theoretical and experimental 

 numbers : — 



166 100-00 



This body is therefore nitrobenzamidej having the same rela- 

 tion to nitrobenzoate of ammonia as cuminamide has to cumi- 

 nate of ammonia. 



This beautiful substance can only be obtained with diffi- 

 culty, as the nitrobenzoate of ammonia explodes violently 

 unless very great caution is employed. 



A specimen of chlorobenzoic acid, made In the laboratory 

 for some other investigation, was dissolved in ammonia and 

 heated ; it fused readily, became perfectly insoluble in cold 

 water and ammonia, but soluble in hot water, crystallizing as 

 the solution cooled in long needles of great beauty. The 

 specimen of acid afforded me, being all that could be spared, 

 was insufficient for the manufacture of an amide ; I prepared 

 a portion of chlorobenzoic acid by acting upon benzoic acid 

 for some days with hydrochloric acid and chlorate of potash ; 

 after purification it was burnt with chromate of lead and gave 

 the following results : — 



I. 0-394 grm. = 0-769 of carbonic acid and 0-114 of water. 



From this result the following per-centage was obtained : — 



Carbon . 

 Hydrogen 



leading to the formula HO, C,4 4 ^j* V Og, 1 equiv. of the 



hydrogen of benzoic acid replaced by an equivalent of chlo- 

 rine. 



This acid, however, on being subjected to the usual treat- 

 ment by solution in ammonia and subsequent heat, did not 

 fuse but blackened, charcoal being separated. Unfortunately 

 the specimen of ammoniacal salt from which I had made the 

 former compound was not analysed, probably it would have 



