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



Table XIV. 





Y. 



«, 



z ; ,. 





69-54 



69-60 



69-43 





•57 



•60 



•46 





•54 



•57 



•51 





•62 



•63 



•51 





•57 



•57 



•38 





•59 



•55 



•51 





•57 



•57 



•51 





•57 



•57 



■56 





•51 



•65 



•56 





•51 



•63 



•62 





•51 



•60 



•59 





•59 



•57 



•59 



Mean 



69-56 



69-59 



6952 



Probable error . . . 



•007 



•006 



•013 



Thermometer ... 



o 



2 



2 



3. Trinitrotoluol. — A. Some crude coal-tar dinitrotoluol 

 was heated with about five times its weight of " fuming " 

 nitrate for more than thirty hours, but not so as to cause ebul- 

 lition of the liquid. It had lost about 15 per cent, of its 

 weight, but, as shown by its melting-point, had not been con- 

 verted into trinitrotoluol. — B was lost in the process of crys- 

 tallization. — C. The deposit from the nitric mother-liquid of 

 the preparation fused at about 59 0- 7. The substance itself 

 fused at about 80 0, 8 when crystallized nine times from spirit; 

 and then, when kept a few days, its melting-point rose to about 

 181°*8. A small residue from the entire preparation, crystal- 

 lized thrice from spirit, thrice from naphtha, and thrice from 

 spirit of wine, fused at 182 0- 8 nearly. This body is soluble in 

 naphtha, insoluble in cold and very sparingly soluble in hot 

 spirit, insoluble in water or aqueous ammonia. Quantitative 

 experiment seems to indicate that it is a compound of dinitro- 

 toluol with trinitrotoluol. In appearance it closely resembles 

 trinitrotoluol. Subsequent attempts to prepare it, both directly 

 and in the nascent way, did not succeed. — D. The result of 

 A was confirmed. 



E. A specimen of coal-tar trinitrotoluol about 3 years old, 

 yellow at the top ; the melting-point of the lower and colour- 

 less part was taken. (This result will be noticed separately.) 

 The remainder from this first determination (part being yel- 

 low) was crystallized twice from naphtha and once from spirit 

 of wine. The results are given under the first E column: the 



