Dr. E. J. Mills's Researches on Melting-point. 11 



in a large volume of dilute sulphuric acid. It is the charac- 

 teristic product of the reaction; but a little bromaniline is also 

 formed, with traces perhaps of dibromaniline. It was purified 

 by extraction with aqueous hydric chloride diluted with nine 

 vols, of water, by distillation, and by crystallization from spirit 

 with the aid of animal charcoal. Q x was crystallized thrice 

 from spirit, Q 2 four times. In the preparation of tribromani- 

 line, whether from aniline directly or from phenylacetamide, 

 the product is accompanied with a considerable amount of a 

 black substance, non-volatile, and insoluble even in boiling- 

 spirit, which evolves much hydric bromide on distillation, and 

 then carbonizes. 



The determinations headed A, Z, and B were made with a 

 thermometer protected by two glass cylinders ; in the other 

 cases the thermometer was bare. 



The exact observation of the melting-point of tribrom aniline 

 is very difficult, inasmuch as the substance becomes transpa- 

 rent only at the edges of a bead which is for the most part 

 dim and pasty. 



Table X. 





A. 



Z. 



B. 



Q, 



Q 2 . 



1 



Qi- 







o 



o 





o 







11642 



116-07 



116-05 



116-20 



116-14 



116-31 





•26 



•12 



•21 



•31 



■17 



•31 





•28 



•26 



•24 



•23 



•28 



•24 





•17 



•32 



•21 



•15 



•22 



•24 





•31 



•18 



•19 



•26 



•30 



•26 





•23 



•23 



•16 



•31 



•22 



•19 





•27 



•23 



■13 



•26 



•19 



•11 





•23 



•34 



•19 



•28 



•22 



•31 





•28 



•23 



•13 



•31 



•36 



•31 





•26 



•12 



■21 



•23 



•28 

 •28 

 •31 

 •31 



•28 



•36 

 •33 



•36 



•30 

 •39 



•26 



■29 : 



•24 j 





116-27 

 •013 



116-21 

 •018 



116-17 

 •Oil 



116-27 

 •008 



116-27 

 •013 



116-26 

 •011 



Probable error . . . 



Thermometer ... 



2 



2 



2 



2 



2 



3 



C. Toluol Derivatives. 

 1. JSfitrotoluol. — Nitrotoluol was prepared from coal-tar 

 toluol, which had been purified by agitation with oil of vitriol 

 and potash successively, and by distillation. According to 

 Beilstein's recommendation, hydric nitrate of spec. grav. 

 1'48 was dropped into toluol; a stream of air was kept passing 

 through the flask, and a stream of water round it. Through 



