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



naphtha, five times from spirit ; its fusion-point then agreed 

 with that of F-^ and F 2 . 



Such trinitrotoluol is found with great ease, an hour's 

 ebullition with a mixture of equal volumes of oil of vitriol and 

 common nitrate sufficing to produce it. Now the presence of 

 oil of vitriol is a great hindrance to making ordinary tri- 

 nitrotoluol*. 



M. M nitrotoluol was treated with Xordhausen and nitrous 

 nitrate, and yielded 157*1 per cent, of product. The melting- 

 point of this preparation having been found not quite regular, 

 the substance was again treated with the nitrating-mixture, 

 and crystallized twice from naphtha, and thrice (Mj), four 

 times (M 2 ), &c. (&c.) from spirit. 



The crystalline form of this modification of trinitrotoluol is 

 distinct from that of Fj or K x , being much more prismatic and 

 less platy. 



A small preparation (L) of trinitrotoluol made from L dini- 

 trotoluol (itself made from D nitrotoluol) was treated like M, 

 and the melting-point also determined before complete nitra- 

 tion had been effected. This point was 78 o- 91 + *008, after 

 one crystallization from naphtha and two from spirit; and the 

 prismatic character of the crystals was apparent ; but the 

 amount of substance was too little to go on with. 



Table XVI. 





M r 



M 2 . 



M,. 



M,. 



M* 





80-49 



80-53 



80-50 



80-58 



8055 





•36 



•56 



•47 



•53 



•52 





•52 



•58 



•55 



•47 



•55 





•49 



•42 



•55 



•50 



•47 





•52 



•56 



•50 



•53 



•60 





•46 



•42 



•47 



•53 



•58 





•49 



•55 



•58 



•50 



•55 





•49 



•53 



•55 



■50 



•55 





•54 



•50 



•50 



•47 



•52 





•54 



•48 



•53 



•53 



•58 





•49 



•61 



•61 



•53 



•58 





•49 



•58 



•61 



•55 



•55 





•52 



•42 



•53 



•53 



•60 





•54 



•42 



•50 



•53 



•58 



Mean 



8049 



80-51 



80-53 



80-52 



80-55 



Probable error ... 



■008 



•012 



•008 



005 



006 



Thermometer . . . 



2 



2 



2 



2 



2 



Zcit. Chetn. xiii. p. 5 



