AXTISEPTICH 



141 



pH, which controls the reduction potential, on the length 

 of las: is shown in Figure 27. 



Fig. 27. Survivor curves ot strepiococcus lactis treated witli vari- 

 ous concentrations of crystal violet. (From data of Hoffmann, 1943.) 



The assumption of a dual role of the dyes is supported 

 by their effect on cells of different ages. The stronger 

 solutions of crystal violet kill young cells more rapidly 

 than old ones, as in fact, all disinfectants do^ In di- 

 lute solutions, multiplication sets in sooner when the 



1. See p. 42. 



