6 Dr. E. J. Mills's Researches on Melting-point. 



B was prepared from another portion of (D) dibromobenzol. 

 25 grm. were gently heated for two hours with 250 cub. cent, 

 nitrate as before, and allowed to cool during twenty-one 

 hours. The pressed product, which had at first contained an 

 oily body, weighed 17 grm. ( = 68 per cent.): it was crystal- 

 lized twice from naphtha, and thrice &c. (B 3 &c.) from alcohol. 



The melting-point of nitrodibromobenzol i* satisfactorily 

 sharp. 



Table V. 





A 3 . 



A*. 



K 



B 3 . 



B 4 . 



B.. B 5 . 





8349 



o 

 83-43 



o 



8346 



83-46 



83-49 



8350 83-32 





■53 



•48 



■46 



•49 



•49 



■52 -49 





•47 



•46 



•51 



•46 



•44 



•50 44 





•55 



•54 



•43 



•43 



•54 



•45 -47 





•47 



•46 



•49 



•46 



•49 



■52 -49 





•55 



•43 



•43 



•44 



•46 



•48 -55 





•53 



•48 



•51 



•39 



•57 



•52 -57 





•53 



•54 



•49 



•49 



■52 



•50 -49 





•47 



•54 



•49 



•46 



•52 



•50 -41 





•49 



•48 



•46 



•52 



•52 



■60 -52 





•53 



•51 



•49 



•44 



•41 



•50 -52 





•55 



•51 



•49 



•46 



•49 



■52 -49 



Mean 



83-51 

 •006 



8349 

 •007 



83-48 

 •005 



83-46 

 •006 



8349 

 •008 



83-51 83-50 

 •006 -008 



Probable error . . . 



Thermometer . . . 



2 



o 



2 



2 



o 



3 2 



B. Aniline Derivatives. 



1. Monochlor aniline. — Sample A was prepared from chlori- 

 nated acetanilide*, free from toluol. It was purified by solu- 

 tion in aqueous hydric chloride, evaporating thrice to dryness 

 after filtration, precipitating with ammonia, and distilling in 

 a current of steam. The product was crystallized twice from 

 naphtha, and thrice &c. (A 3 &c.) from alcohol. 



B was prepared more directly from aniline by the following 

 method: — Half a pound of aniline, purified by cohobation for 

 several hours with one sixteenth of its weight of mercuric 

 chloride, was mixed with a pound of glacial acetate, and chlo- 

 rine led slowly over its surface. Considerable heat was evolved. 

 When this sign of action ceased to be manifested the mixture 

 was allowed to cool, and the now solid product heated with 

 water and caustic soda : the oily layer thus formed was with- 

 drawn, and cohobated for a few hours with alcoholic potash. 

 Water was next added to this solution audits residue; and the 



* For the details of the methods of obtaining aniline derivatives from 

 acetanilide see Proc. Roy. Soc. x. p. 589, and Phil. Mag. 1875, xlix. p. 21. 



