Dr. E. J. Mills's Researches on Melting-point. 23 



ex. dinitrophenol melts sharply, the pasty stage being short. 

 According to Htibner and Schneider its melting-point is 63-64°. 



Table XX. 



4. /3 Dinitrophenol. — Z. The crude compound was pre- 

 pared by G-riiner's method, from crystalline phenol. A con- 

 siderable amount of its baric salt was crystallized repeatedly 

 from a large volume of water, and the cooled and filtered 

 mother-liquid precipitated with hydric chloride. 



Z e was the tenth precipitate; it was crystallized thrice from 

 water. 



Zf was the eleventh precipitate ; it was crystallized once 

 from water. 



Z,, was the twelfth precipitate; it was crystallized once from 

 water. 



Preliminary determinations of melting-point were made 

 with the nine preceding fractions ; but the numbers were not 

 sufficiently satisfactory to warrant proceeding with purification. 



Y was made by Dr. Armstrong from trinitrophenol, by way 

 of amido-dinitrophenol; it was crystallized thrice from water. 



T. For this also I am indebted to Dr. Armstrong: he had 

 prepared it by acting with ordinary hydric nitrate on phenol. 

 It was crystallized once from naphtha, once from alcohol, and 

 four times from water. 



