318 



KEPOET 1882. 



points to rise by a constant quantity, as supposed by Kopp, but that in a 

 large number of cases the increments to the boiling temperatures diminish, 

 by a constant amount. Where such a series has been established the 

 three columns of the tables contain, respectively, the boiling points for 

 a barometric pressure of about 72-5 mm., the differences between these 

 numbers, and the nearly constant diminution of the differences. 



Bar. 725 mm. 

 Toluine, CH^ CJi^ . 



Diphenyl methane, CHj (C6H5)2 



Tripbeiiyl methane, CH (06115)3 



*Tetrapheiiyl methane, C (CgHs)! 



Bar. 775 mm. 

 Hydrocarbon from Toluene red, C„,H2„ 

 Hydrocarbon from Xylidine red, C22H2: 



Bar. 717 imii. 

 Benzine, C^Hs . . . . • 



Diphenyl, C,H, C^H, 



*Diphenyl benzine, ? C,H^ (Cfi.y 



Triphenyl benzine, CJi^ (CuH.)^ 



Bar. 725 mm. 

 Benzine, C^U.,^ 



Naphthaline, CjoHg . 



Phenanthrene, C,4H,j 



Chrysine, CjaHu 



Picine, C22HH . • 



Pyrine (Phenyline Naphthaline), bar. 723-7 mm., boiling point 391°-8 

 Anthracine, CnH,o, bar. 721-6 mm., boiling point 341° 

 Anthraquinone, CnH802, bar. 723-5 mm., boiling point 374° 



*The boiling points of tetraphenyl methane and of diphenyl benzine 

 are hypothetical ; these bodies have not been studied. 



Benzophenine, CO (C^HJ^, bar. 720 mm., boils 303°-5 



Difference 73° 



Sulphobenzide, SO2 {CJi,)., bar. 720 mm., boils 376°-5 



Monochlorated sulphobenzide S02,C6H5, CeH4Cl,bar. 719 mm., boils 389° 



Sulphotoluide, SO., (C,H-)., bar. 714 mm., boils 405° 



Durol ketone, CO (C,„H, J„, bar. 724 mm., boils 342°-343° 

 : Phenyline sulphide (C^H^S),, bar. 716 8 mm., boils 358°-8 

 ' Carbazol, bar. 730-8 mm., boils 350° 



Base from Anthracine blue, bar. 724 mm., boils 445°-5 



Phenyl naphthyl amine, NH (C,„Hj) (CgHj), bar. 720 mm., boils 395°-5 



Hexa-methyl benzine, C (CHs)^, bar. 752, boils 262°-2-264°-4 



Note. — The above communication is little more than an abstract of that made 

 by the author, by word of mouth, at the meeting of the Association, as, from unavoid- 

 able circumstances, he has been unable to prepare the whole of his manuscript 

 for publication in time for the present volume. 



520° 



