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

 Table XI. 



13 



. 



C. 



... 



C c . 



D 4 . 



D 6 - 



I> 6 . 



D T . 



B. 

























n 





5143 



51-39 



51-22 



51-22 



51-27 



51-34 



51-34 



51-31 





•29 



•39 



•37 



•32 ' 



•10 



■39 



■39 



•34 





•40 



•46 



•30 



•35 



•10 



•17 



•24 



•29 





•31 



•37 



•40 



•25 



•35 



•32 



•39 



•34 





•29 



■34 



•32 



•37 



•37 



•14 



•39 



•21 





•31 



•34 



•35 



•37 ; 



•35 



•17 



•34 



•34 





•34 



•24 



•37 



•35 



•35 



•19 



•39 



•34 





•47 



•24 



•48 



•09 | 



■27 



•32 



•39 



•37 





•31 



•32 



•24 



•35 



•39 



•29 



•30 



•16 





•24 



•21 



•25 



•27 



•39 



•17 



•32 



•39 





■31 



•26 



•19 



•22 



•27 



■27 



■36 



•29 



; 



•21 



•41 



•14 



•35 



•39 



•14 



•30 



•29 





•31 



•26 



•26 



•14 





•32 



■22 



•29 



i 



•24 



•37 

















•31 



Mean 



51-32 



51-33 



51-30 



51-27 



51-27 



51-35 



51-34 



51-30 



Probable error ... 



•on 



•013 



•017 



•016 



•016 



•016 



•010 



•010 



Thermometer . . . 



2 



3 



2 



2 



3 



3 



3 



2 



2. Dinitrotoluol. — I have investigated the melting-point of 

 this substance as prepared (1) directly from toluol. (2) from 

 liquid nitrotoluol ("metanitrotoluol"), (3) solid nitrotoluol 

 when the active masses are relatively small, and (4) solid 

 nitrotoluol when the active masses are relatively large. 



[Case I.] Dinitrotoluol was prepared from coal-tar toluol, 

 which had been purified by agitation with oil of vitriol and 

 potash successively, and distillation: a mixture of oil of vitriol 

 with hydric nitrate was used. The product was pressed to 

 free it from oily matter, and crystallized from spirit. The por- 

 tions that fell successively in the act of crystallization were 

 called A, B, C, D, and many experiments were made with 

 them; but the results were not very accordant. The four 

 samples were fractionally crystallized from spirit : the first 

 deposits being called A 1; B x , &c; the second, A 2 , B 2 , &c. 



Fractions of F (an old preparation) were also employed. 



Melting-points having been taken, C t , F 4 , and F 3 were 

 found to coincide, and mixed together. Four successive 

 fractions of the mixture were taken; and after some further 

 fractionation. 



(F 2 ) 2 , (F^, [(F.FA),]*, [(FaFAtt, (F,F 4 d)i 

 yielded a; 



K B 1; (F,)i, [(F,FA) 4 ]„ [F,FA)4]i, [(FsFA)*], 

 yielded b; 

 C 2 , (F x ) 2; [(F 3 F 4 C 1 ) 2 ]i yielded c; 



Ao, Bfl 



D yielded d. 



