418 [Jan. 22, 



In conclusion I may be allowed to express my best thanks to M. 

 Menier : without the magnificent crystals furnished by his ateliers, I 

 could not have even attempted to clear up this question. 



Though proud of her office as guide of industry, science acknow- 

 ledges without blushing that there are territories on which she cannot 

 advance without leaning on the strong arm of her powerful companion. 

 Joint labours of this kind cannot fail to seal the pledge of alliance 

 between industry and science. 



II. " On some new Compounds obtained by Nitrogen-substitu- 

 tion, and new Alcohols derived therefrom/' By PETER 

 GRIESS, Esq. Communicated by Dr. HOFMANN. Received 

 December 18, 1862. 



In the beginning of this year (1862) I pointed out* that diazo- 

 amidobenzol, when submitted to the action of nitric acid containing 

 nitrous acid in solution, is transformed into a new compound accord- 

 ing to the equation 



C lfe H n N 8 + 2HNQ 2 + HN0 3 =2(C 6 H 4 N 2 ,HNQ ? )-f2H 3 0. 

 Diazo-amidobenzol. New compound. 



I have now found that this remarkable compound, the nitrate of dia- 

 zobenzol, can be much more easily produced by the action of nitrous 

 acid upon nitrate of aniline, 



C 6 H 7 N, HN0 3 + HN0 2 ==C 6 H 4 N 2 , HNO 3 + 2H 2 O. 



Nitrate of aniline. Nitrate of diazobenzol. 



This process has furnished me a considerable number of similarly con- 

 constituted nitrogen-substituted derivatives, not only of monacid 

 monamines, but also of diamines ; and it is to some of the bodies 

 generated by means of the latter that I beg leave to call the atten- 

 tion of the Royal Society. 



If a current of nitrous acid be passed into a cold solution of the 

 nitrate of benzidine, a base which, by the researches of P. W. Hof- 

 mann, has been characterized as a well-defined diacid diamine, a new 

 compound is produced, crystallizing from water in white needles, 



* Ann. Chem. Pharm. 



