336 PHARMACEUTICAL BACTERIOLOGY 



the phenol toxicity coefficient as proposed by Hale, we would get the 

 following results. 



Phenol ioo 



Betol 33-3 



Resorcinol -. 25 



Corrosive sublimate 3000 



As a rule, however, the exact composition of disinfectants is either not 

 known or is not disclosed by the manufacturers and in such cases the only 

 thing to be done in order to ascertain whether or not the claims of the 

 manufacturers are correct is to make tests as above outlined. However, 

 in cases where the composition of the disinfectant is definitely known, 

 whether a simple or compound substance, its comparative toxicity can be 

 determined by ascertaining the toxicity of the ingredients and rating with 

 the standard, namely pure phenol. 



The Toxicity and Germ Destroying Power of Some Disinfectants 



The values given are obtained from various sources and in some in- 

 stances require further verification. The table will serve as a guide to a 

 valuation of the disinfectants for purposes of general disinfection. 



GERM DESTROYING POWER AND TOXICITY OF DISINFECTANTS 



Name Destroying Toxicity 



Phenol i Phenol ioo 



Alcohol . 03 o . 05 



Alum , 0.64 10. oo 



Ammonia 2.40 15.00 



Ammonium chloride 0.03 10.50 



Ammonium sulphate 0.015 5-o 



Antozone o . oo 



Arsenious acid 0.50 5000.00 



Arsenite of soda 0.33 3000.00 



Bacterol 1.58 45 . oo 



Benetol i . 23 33 oo 



Bichloride of platinum 10.00 



Boracic acid 0.23 5.00 



Bromine 5 . oo 



Cabot's sulpho-naphthol 3.87 11.00 



Calcium chloride o. 08 3 . 50 



Camphor 33 .30 



Carbolene i . 36 1 1 . oo 



Carbolozone i . 48 6 . 40 



Car-sul 2.00 16.00 



Caustic acid 0.17 120.00 



Chinosol 0.95 25 . oo 



Chloride of gold ., 12.50 



Chlorine ; ' 12 . 50 



