Chemical Action in I he Crystalline State. 



573 



4. Decomposition of Tetranitroaniline, 



The similarity of the curves in figure 5 to those previously 

 given is apparent. Experiment XIV. (Curve II.), the most 

 fortunate of several trials, was sufficiently precise to allow 

 not only a t, a?, curve to be drawn, but also an accurate 



Fiff. 5. 



I. Tetranitroaniline at 140° C. 

 II. Tetranitroaniline at 120°-0 C 



III. Derived curve from II. Ordinates 



(different scale). 



Small crystals. 



dx 

 dt 



Abscissae x. 



derived velocity curve, since the lower temperature, 120°0 C, 

 was more easilv controlled, and in this particular experiment 

 did not vary by more than ^C. In the figure the derived 



different scale from the other 



curve 



/ dx 



\dC 



• J is plotted 



on a 



two curves. It will be observed that the velocity increases 

 steadily almost throughout, falling away sharply near fche end 



