/ 
( 822 ) 
group is split off by boiling with phenol or acetic acid. The 3.4- 
dimethyl derivative also reacts readily with nitrous acid in sulphuric 
acid solution; the compound formed is sull under investigation. 
Finally, I have allowed nitrous acid to act on the dark red 3.6- 
dinitrodiethylaniline (m. p. 76°) when a beautiful pale yellow nitroso 
compound (m. p. 69°) is formed, which on being boiled for a moment 
with acetic acid, yields on dilution with water beautiful red needles of 
the 3.6-dinitromonoethylaniline (m. p. 120°) previously described by 
me, so that in this case also one of the ethyl groups has been eli- 
minated. The 3.6-dinitrodimethyl compound behaves in quite an 
analogous manner, just like p. nitrodiethylaniline. 
These experiments are being continued with other tertiary nitrated 
amines. 
Utrecht. University Org. Chem. Lab. 
Chemistry. — “Confirmations of the new theory of the phenomenon 
of allotropy.” 1. By Prof. A. Smits and Dr. H. L. pr Lenuw. 
(Communicated by Prof. vaN per WaAats). 
(Communicated in the meeting of December 24, 1910). 
As was set forth before’) the above-mentioned theory leads us to 
expect that for every substance which presents the phenomenon of 
heterogeneous allotropy, so monotropy ov enantiotropy, the phenomenon 
of homogeneous allotropy will also occur, because the two phenomena 
are in the closest connection. 
So in virtue of this theory we can expect for the monotropic and 
enantiotropic substances that every vapour, liquid, or solid phase in 
stable condition consists of an internal equilibrium between different 
kinds of molecules. A consequence of this is then that when we 
make the temperature vary so rapidly that the internal equilibrium 
cannot keep pace- with the temperature, the more complex nature 
of the substance will appear, which will, among others, manifest 
itself in a boiling or melting range of temperature, in which the. 
final boiling point, resp. final melting point will lie higher or lower 
than the unary stable boiling point, resp. melting point, dependent 
on the type of the pseudo-system and of the direction of the line 
which indicates the internal equilibrium in the vapour, resp. liquid 
phase. 
t) These Proc. March 1910 p. 768. 
