DISINFECTANTS 



73 



experiments as follows : 9.35, 5.59, 11.17, 8.76 ; average : 

 8.96. A second identical experiment gave n = 7.04 as 

 the average of four determinations. If such fluctua- 

 tions are obtained by experienced investigators, it is 

 evident that concentration exponents are not reliable 

 enough to serve as a basis for speculations on the mech- 

 anism of the lethal reaction. 



TABLE 15 



Concentration exponents of some disinfectants. 

 J. Acids (Paul, Birstein and Reuss, 1910) 



77. Alcohols (Tilley, 1939) 



777. Various Compounds 



Phenol 5.5 (Chick, 1908) 



Formaldehyde 1.0 (Gegenbauer, 1922) 



Hydrogen peroxide 0.5 (Reichel, 1908) 



Hydrogen peroxide 1.7-2.6 (Rahn, unpublished) 



Silver nitrate 0.9 (Chick, 1908) 



