( 706 ) 



of the nitramine in benzene gave results which wore still loss 

 favourable. 



One of us had noticed previously that among the aromatic amines 

 which generally react on an alcoholic solution of the nitramine 

 quite as readily as on picryl chloride, /y-toluidine in particular gives 

 a beautifully crystallised p-toluylpicramide m. p. 166° x ) whilst the 

 alcoholic solution contains only comparatively few, not very dark 

 coloured byeproducts. In an experiment in which 35 grams of the 

 nitramine were heated on the waterbath with ai) equal weight of 

 ^-toluidine and 100 c.c. of i)6 u / (( alcohol, a fairly violent reaction set 

 in after some time. The heating was continued for 5 hours and, 

 after the picramide derivative had been removed by filtration, the 

 alcohol was distilled off and the residue extracted with dilute sulphuric 

 acid. The liquid filtered off from the toluidine sulphate was shaken 

 with ether. On evaporation of the ether a still yellow coloured liquid 

 product was left which on being inoculated with a crystal of methyl- 

 nitramine became crystalline and after having stood for some 

 time over sulphuric acid weighed 7 grams. On pressing between 

 filter paper light yellow crystals were obtained which after being 

 sublimed in vacuo (a treatment which metliylnitramine stands very 

 well) melted at 38 D . On mixing the same with a preparation con- 

 sisting of pure nitramine the melting point was not affected. 



yM-Toluidine appears, therefore, to be a suitable means for readily 

 procuring in a short time methylnitramine from s-trinitrophenyl- 

 nitramine. 



We are continuing our investigations with different amines and 

 also with other nitrated aromatic nitramines, and will state the 

 results more elaborately in the "Recueil". 



Org. (Jhem. Lab. of the University Utrecht. 



Physics. — " Wave-lengths of formerly observed emission and ab- 

 sorption bands in the infra-red spectrum." By Prof. W. H. 

 Julius. 



If in the infra-red spectrum, as formed by means of a rock-salt 

 prism, the positions of emission or absorption bands have been care- 

 fully determined, the corresponding wave-lengths still are uncertain 

 by an amount which, in a considerable part of the spectrum, is 

 greater than the probable error of those determinations, because the 



l ) We now obtained this substance in two modifications, one coloured dark red 

 and the other orange. 



