96 P. T. Austen- Dinitroparadibrombenzols. 



especially in glacial acetic acid, carbon disulphide, acetic 

 ether,* alcohol, etc. 



It fuses at 99°-100°t to a yellowish liquid. 0-2940 grras of 



substance gave 0-0330 gnus, of [1 = 0, and 0-2418 grms. of CO 2 . 



Calculated for C 6 H»(N0 2 ) ! Br 2 . Found.J 



C=22-08 22-43 



H= 061 124 



The compound is somewhat volatile. Inspiration of its 

 vapors occasions an intense inflammation of the mucous mem- 

 branes. An alcoholic solution, when brought upon the skin, 

 excites itching, smarting, and inflammation accompanied by 

 subsequent peeling off of the skin. A minute quantity 

 brought in contact with the eye causes a sharp pain lasting sev- 

 eral days. On the more sensitive skin of the face it gives rise 

 to a smart which, after it has attained a maximum, suddenly 

 vanishes. It is hence a powerful excitant. 



* It is very striking that nearly all substances which are soluble in glacial 



not quite free from the isomei pa ration of the last traces of 



Jv difficult. The greatest care is also necessary in the 



from glacial acetic acid, while two ra p oved that two- 



thirds of the mixture consist ig at 136°. 



1 1 have rarely analyzed a substance which was so refractory during combus- 



pound, as well as of many other 



substances encountered in this ir 



,vestigation,Ihave 







has of late found 















employed it, in most cases, in p 







2mmTh° a ym e ' b ^ r°™ ° f * 



picute (length about 1 0mm., di: 











mortar with lead chromate to w 







wards added, and the whole agi 







the tube, the mortar is well 



washed out with a mixture of o 



xide and chromate 





i added to the contour, of t<- i 



mbe. The tube is 













tk end so that the 







be is rapped longi- 



tudinally. The heavy pulverul 







channel filled with a net-work o 





ve to pass through 







surface. Loss by 



sublimation is entirely avoided, 





sarily be deposited 



on the spicuhe and by them be 



completely oxidized. In case t 



he compound con- 



