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I. Nitro- and Nitroso-Derivatives of the Benzene-Series. 
In consequence of some crystallographic facts, I intended long ago 
to make a special study of morphotrophic action of NO, and NO 
substitution in organie molecules. The matter became still more 
important to me by the observation of the transformation of o- Nitro- 
benzaldehyde into erystallised o-Nitrobenzoic acid under the influence 
of light, and by a recent treatise of Brunt and Carrecart (Gazz. 
Chim. It. (1904) 34. II, 246) who determined this formation of solid 
solutions according to cryoscopic determinations. These investigators 
arrive at the following conclusions : 
1. As a rule aromatic nitrosoderivatives may form solid solutions 
with the corresponding „itroderivatives. 
2. In those solid solutions, also in the liquid ones which havea 
green colour the nitroso-compounds have the simple molecular size. 
It was particularly the first conclusion, which T wanted to submit 
to a further investigation. 
a. Paranitrodiethylaniline and Paranitrosodiethylaniline. 
First of all I have extended the investigations paranitrodiethyl- 
aniline by Senraur and myself‘). As I could only get proper erystals 
of the nitroso-derivative from ethyl-acetate + ligroine it was necessary 
to obtain the erystals of the /tro-devivative from the same solvent 
in order to get strictly comparable preparations. 
1. p-Nitrodiethylaniline. 
C,H,.(NO,).N(C,H,), ; meltingpoint : 73°,6. 
Crystals from ethyl-acetate + ligroïne. (Fig. 1). 
Fig. 1. 
=F 0 
fl i a DES 
ne on ; Af} 
g bere 
Sy Ar SJ) << 
fr Nn — f 
| =n A 
n' a mt 04 
k 2 
Dn 
p-Nitrodiethylaniline, from 
ethyl-alcohol. 
p-Nitrodiethylaniline, from 
ethyl-acetate. 
1) Jarcer, Z. f. Kryst. 40. 127. (1905); cf ibid. 11, 105, Ref. 
