SOME EXPERIMENTS WITH DISINFECTANTS 27 



than 4 to 5 per cent., and for sporing organisms it ought to be still 

 stronger. It appeared to have only about a fourth to a half of the 

 germicidal power of phenol. 



2. Cyllin. — In the degrees of dilution with which Klein obtained 

 satisfactory results, and after the same exposures, cyllin in my hands 

 has not yielded the same results. At the same time, it is evidently a 

 disinfectant of great power, being effective against non-sporing organisms 

 in dilutions of i in 500. My tests would lead me to rank it as about five 

 to six times as potent as phenol. 



3. Izal is another powerful disinfectant, being probably eight to nine 

 times more active than phenol. Against some organisms, as B. anthracis, 

 it is less active than corrosive sublimate, but against Staphylococcus 

 pyog. aureus it is more active. 



4. SapO'Cresolxs evidently a very active disinfectant. In my experi- 

 ments, it was more powerful than izal towards B. typhosus, but less so 

 towards Staphylococcus ; while, in comparison with cyllin, it was more 

 powerful against both these organisms. 



5. Sanitas showed itself in these experiments to be by much the 

 least active of the disinfectants tested. Apparently, it can only be 

 relied upon when applied undiluted, and even then it may fail to kill 

 sporing organisms. 



6. Corrosive Sublimate, in the same dilutions as cyllin, showed itself 

 to be more powerful than this antiseptic, especially in attacking the B. 

 typhosus and anthrax spores. In its action on Staphylococcus, 

 however, it is less effective than cyllin. This relative lack of efficiency 

 against Staphylococcus is in agreement with the observations of 

 Andrewes. 



(263) 



