II. and P. Ryan — Action of Nitric Acid and Nitrous Acid. 217 



4. In addition to the dinitro-diphenylnitrosamines which had separated 

 during the reaction, the flask to which i-molecular amov/nts of nitric acid had 

 been added contained 2A.8-trinitro-diphewytamine dissolved in the carbon 

 tetrachloride. 



5. The solid which separated in the flask to which Q-moiecular amounts of 

 nitric acid had been added, again consisted of a mixture of diivitro-dijihenyl- 

 nitrosamincs, and the carbon tetrachloride solution contained 2A.8-trinitro- 

 diphenylamine (M. P. 18o-184°C), and 2A.8A0-tetranitro-diphcnylamine. 



In conclusion, we beg to thank Nobel's Explosives Company for the 

 materials employed in this investigation, and Mr. Eintoul, the Manager of 

 the Research Section of that Company, at whose suggestion the investigation 

 was undertaken. 



We are also indebted to the Advisory Council for Scientific and Industrial 

 Research for a grant which enabled us to carry out the work. 



