Oct. is, 1920 



Germicidal Value 0} Some Chlorin Disinfectants 



99 



This technic was used in making a number of comparative experi- 

 ments with chloramin T, Dakin's solution, eusol, and mercuric chlorid. 

 The results are given in Tables XII and XIII. 



Table XII —Comparative germicidal efficiency of chloramin T, Dakin's solution, eusol, 

 and mercuric chlorid against Bacillus tuberculosis, with and without the addition of 25 



per cent blood serum 



EXPERIMENT 22 



Disinfectant and dilution. 



Chloramin T: 



1 to 1,000 



Do 



Dakin's solution: 



NaOCl 1 to 1,000. ■ • 



Do 



Eusol: 



HOC1 1 to 1,000 



Do.... 



Mercuric chlorid: 



1 to 1 ,000 



Do 



Tubercle bacillus suspen- 

 sion. 



Do 



Amount of serum. 



Guinea 

 pig No. 



None 



25 per cent. 



None 



25 per cent. 



None 



25 per cent. 



None 



25 per cent. 



+ serum . 



S34I4 

 53415 



534i6 

 53417 



534i8 

 53419 



53420 

 53421 

 53422 



53423 



Result. 



Autopsy. 



Died . . . 

 ..do... 



. . do . . . 

 ...do... 



Killed** 

 Died . . 



...do... 

 ...do... 

 ...do... 



...do... 



Typical lesions. 

 Do. 



Do. 

 Do. 



Do. 



Do. 



Do. 

 Do. 



Do. 



EXPERIMENT 23 



Chloramin T: 



1 to 100 



Do... 



Dakin 's solution : 



NaOCl 1 to 500 ... . 



Do 



Eusol: 



HOC1 1 to 250 



HOC1 1 to 500 



Mercuric chlorid: 



1 to 500 



Do 



Tubercle bacillus suspen- 

 sion. 



Do 



None 



25 per cent. 



None 



25 per cent, 



.do. 

 .do. 



None 



25 per cent. 



+serum 



54023 

 54024 



54025 

 54026 



54027 

 54028 



54031 

 54032 

 54033 



54034 



Died . . . 

 ..do.... 



..do.... 

 ..do.... 



..do.... 

 . .do. ; . . 



Killed & 

 Died . . . 

 ...do..., 



...do... 



Typical lesions. 

 Do. 



Do. 

 Do. 



Do. 

 Do. 



Do. 

 Do. 



Do. 



a Killed after 33 days; perfectly normal. 



b Killed after 2 months; perfectly normal. 



Experiments 24 and 25.— In these experiments the disinfectants 

 were compared on the basis of the available chlorin contained, so these 

 experiments are grouped by themselves in Table XIII. 



In the experiments upon Bacillus tuberculosis, as in experiments 

 upon anthrax spores, it was necessary to use Dakin's solution and eusol 

 of greater strength, and, as before, this result was obtained by lessening 

 the amount of water while the other ingredients and the method of 

 manufacture remained unchanged. 



