GERMICIDES, ANTISEPTICS, AND ANTISEPSIS 267 



dilution (1:80), thus ^ = 4.69, and the same is done for 



the strength that kills in fifteen minutes, namely: 



650 



^ = S-Qi 

 no 



The average of these, -' ^~~ == 5-3o> is called the co- 

 efficient. In other words, disinfectant A has a value of 

 5.30 times that of phenol. A disinfectant with a phenol 

 coefficient less than i is of very low germicidal value. 



