( 251 ) 



100 Vo ÓO ÓO </0 ZO O 



Fig. 1. Melting point curve of <>■ and p-nitrotoluene. 



Mr. van den Arend found the following figures for the specific 

 gravities of o- and p-nitrotoluene and for some of their mixtures, 

 at 80°.0: 



100 % 

 89.4 „ 

 68.4 „ 

 61.0 „ 

 4<i.5 ,. 



^-nitro toluene 



1.0981 calculated from 



1.0993 the sp. gr. o£o-and 



1 . 1007 of/>-nitrotoluene 



1.1014 l.looii 



1.1023 1.1015 

 L.1033 

 1.1045 M 



32.0 „ 

 0.0 (loo " o o-nitrotoluene . 



The figures calculated arc those which may be deduced from fhe 

 specific gravities of the isomers without contraction taking place 

 The graphic representation of these figures gives the subjoined diagram 



! ) Dr S. van Dorssen lias also at my request determined the specific gravities 

 of o- ami p-nitrotoluene by means of an Kykman's pyenometer verified by himself 

 and found as the average result al 80°.0 of four and three determinations respec- 

 tively: o-nitrotoluene 1.1050; p nitrotoluene 10993, values which are both a little 

 greater than those of van den Arend. All the values have been corrected for vacuum 

 and the expansion of the glass. I will, however, use v. i>. Arend's figures because 

 lie lias made all his determinations with the same pyenometer ami therefore the 

 results are sine lo he mutually comparable. 



17 



Proceedings Royal Acad. Amsterdam. Vol. XI. 



