358 



PHYSIOLOGY OF BACTERIA 



dissolved HgCl2, hydrogen sulfide will precipitate HgS 

 from the protein compound, and the protein is liberated 

 again. 



These experiments were repeated with yeast and gave 

 the same general results. 



Then, Gegenbauer made disinfection experiments with 

 Micr. pyogenes in different concentrations of HgCl2, 



<^ / 2 3 tf S 10 iO 30 ¥) 50 75- 100 /toun 2Q0 



Fig. 41. — Influence of the concentration of HgCh upon the length of time 

 required to prevent growth of Micrococcus pyogenes when the poison is 

 removed by washing (left curve) and when it is removed by an antidote 

 (right curve). 



in one series washing the bacteria after disinfection 

 repeatedly with water, in the other treating them with 

 H2S to remove or counteract the poison chemically. 

 The results are summarized in Table 113. There are 

 nine series with chemical treatment, and three series 

 with washing only. Parentheses in the table indicate 



