204 Proceedings of the Royal Irish Academy. 



The solid which separated was filtered, washed with acetic acid, water. 

 and alcohol, and dried in the air. It melted, with decomposition, at 155- 

 md a mixture of it witli JTO dinitro-diphenylnitrosamine melted 

 about 148° C. It g lalysis the following results : — 



21 . .ram substance gave 35 ccs. nitrogen 

 at 17 C. and 762 m.ui.p. 



corresponding N 1 9*2. 



I .H.N. 1 ' requires N 194. 



The substance was, fchei dinitro-diphenylnitrosamine, and the 



melting-point of a mixture of it with -^-dinitro-diphenylnitrosamine 

 (melting-point 148-151 C.) melted about 14" ('. Since it is not identical 

 with 2-10- "i 2-4-dinitro-diphenylnitrosamine, it is probably i-10-dinitro- 

 iliji'b ■ 



When il with xylene under a rerlux condenser for two hours 



brown fumes ind from the solution a very small quantity ■ •• 



- . ' i. and a 



portion Bomewhal in carbon tetrachloride, which melted from 205- 



The 2*4-8- 10-tetrani- 



diphenylamii ibably pn an impurity in the original sub- 



iii a la [intent a- . r mean temperature the chief 



compound « tiou was 2'£'8'10-tetrcmitro- 



. 



The yellow -"lid which w ■■■! from the above-mentioned acetic 



acid solution was filtered, dried, and washed with chloroform and alcohol. 

 Tin' residue, after recrystallization from xylene, washing with hot carbon 



ichloride and cold acetone, was found to '■"■ 2*4*8'] O-tetranitro-diphenyl- 



amine. Tl hloroform-alcohol parent liquid "ii evaporation L r a\<- a li>_dit- 



yelkr* lid. from which no pure snbsl 



In conclusion, we wish to express our thank- t" Nobel's ExploE 



_ ' ion, ami to Mr. Rintoul, the 

 manager of the! Sect thai company, at whose suggestion the 



investigation was undertaken. 



