15 



26 QUATERCENTENARY STUDIES IN PATHOLOGY 



SAPO-CRESOL. 



Organism. 

 B. typhosus. 



Staph, pyog. aureus. 



( + =Growth; — =No Growth). 



Growth was absent in dilution of I-750 after 10 minutes' exposure, and in 1-800 after 15 

 minutes' exposure, in the case of B. typhosus ; while in the Staph, pyog. aureus, 

 it was absent after 5 minutes' exposure in dilution of 1-400, and, in 1-500 dilution, 

 after 15 minutes' exposure. 



CARBOLIC ACID CO-EFFICIENTS. 



Disinfectant. 



Sanitas. 



Formaline. 



Cyllin. 



Izal. 



Sapo-Cresol. 



Corrosive Sublimate. 



The conclusions to be drawn from these two series of experiments on 

 liquid disinfection — which are summarised in the accompanying table of 

 co-efficients — appear to be as follows : — 



I. Formaline, — In none of the dilutions used — though they are 

 dilutions recommended for disinfectant purposes — and for the exposure 

 tested, was formaline found to be completely efficient as a general 

 disinfectant. The bacillus of typhoid was evidently, however, affected by 

 it in the stronger dilutions. It was evident that even for non-sporing 

 micro-organisms the strength of formaline solution should not be less 



(262) 



