( 666 ) 
A mixture of 10,0°/, p-Nitro- and 90,0 °/, of p-Nitroso-derivative 
commences to solidify at 80°,8 and completely solidifies at 80°,6. 
A mixture of 0°/, of p-Nitro- and 100°/, of p-Nitroso-derivative 
melted at 82°,2. 
The composition is given in molecule-percents. 
0 
In fig. 6 the course of the melting curve is represented graphically 
and the double line for the initial and final solidifying points is 
shown. It will be seen that the character of the line points to a 
continuous series of mixed crystals; the average temperature-interval 
between initial and final solidification amounts to about 0°,5. 
400 90° 80 70 60 50 40 300 MKO 
Fig. 6. 
The result of the research reveals the complete isomorphy of 
p-Nitro-dethylanaline and p-Nitroso-diethylaniline and also their 
complete miscibility in the solid state. 
Chemistry. — “On Orthonitrobenzyltoluidine’. By Dr. F. M. JARGER. 
(Communicated by Prof. A. F. HOLLEMAN). 
(Communicated in the meeiing of March 25, 1905). 
Some time ago the o-Nitrobenzyl derivate of para-toluidine, (melting 
point 72°C.) was investigated by NORDENSKJÖLD, who described it as 
being tetragonal with the parameter-relation a:c = 1:0,6230; the 
compound exhibits only one combination-form, namely {111} and is 
optically monaxial: positive. (Bull. Geol. Instit. Upsala, (1892), 84, 
also Ref. Zeits. f. Kryst. 24, 147). 
