CHEMOTHERAPY 155 



to .sulplioiiaiuides and to penicillin, l)ut. resistance to 

 the acridine dyes and propamidine is harder to induce. 



are also resistant to propamidine, 



NH NH 



'2 



and vice versa. 





Staphylococci resistant to proflavine, I I I I 



NH.X/X /X/NHj 



N 



