COMPARATIVE EFFICACY OF DISINFECTANTS 



83 



prevent putrefaction do not kill the bacteria, they only arrest growth and 

 multiplication. 



II. Lethal Value for Sporeless Tubercle Bacilli. 



. Inferior lethal coefficient ; the time is given in which tubercle bacilli 

 (from cultures, not in sputum) are killed. From Yersin (54). 



Carbolic acid 



Absolute alcohol .... 

 • Iodoform .... 



Ether 



Corrosive sublimate 



Thymol 



Salicylic acid 0-25% 



To kill the bacteria in sputum, where they are embedded in mucus, 

 a much longer time is necessary, e. g. 10 per cent, lysol for twelve hours. 

 The figures in the table were obtained by mixing tubercle bacilli from 

 a growing culture with the fluids, taking out samples from time to time, 

 and sowing them on culture media. The values given may be regarded 

 as being good for most sporeless bacteria, the sensitiveness of which is 

 illustrated by this example. 



III. Lethal Value for Anthrax Spores. 

 From Paul u. Kr'dnig (55). 



A suspension of the spores in water is dried upon silk threads, pieces of 

 glass, or, better still, upon carefully-cleaned garnets, which are then laid in 

 the disinfectant. Specimens are taken out at intervals and sowed in nutri- 



G 3 



