90 THE MITOCHONDRIAL CONSTITUENTS OF PROTOPLASM. 



Diazo-diethylsafranin Dimethylanilin 



N 



(Cs H5)j N- \y\^\/ - N = NOH 





+ /N - N (CHs)! 



Fig. B. 



Diazingriin (janus green) : 





Fi<i. C. 





Diethylsafraninazodimethylanilinchloride: 



N 



(CaHsJN- Ky\./ 



-N=N- r 1 N 



i CI 



(cHj), 



Fig. D. 



This is the janus green B of the Farbwerke Hoechst Company. It is the same as 

 "Diazingriin" and may be the same as "Halbvollgriin," but of this I am not cer- 

 tain. There are two other janus greens of different formula;, which makes three 

 varieties of janus green in all: 



(1) Janus green (Griibler), safraninazodimethylanihnchloride: 



N 



HjN 





N = N 



N (CH,), 



Fig. E. 



