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IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



TABLE NO. 2 INDICATES THE SHORTEST TIME IN WHICH ALL 

 STREPTOCOCCI OF A GIVEN CULTURE WERE KILLED BY VA- 

 RIOUS GERMICIDES AS WELL AS A LIST OF THOSE GERMI- 

 CIDES WHICH FAILED TO KILL ALL THE STREPTOCOCCI AT 

 THE END OF ONE HOUR. 



SUMMARY AND CONCLUSIONS 



1. Streptococci are probably the most important disease-pro- 

 ducing bacteria. 



2. The frequency with which streptococci, are found in the 

 mouth, throat and in connection with wounds, enables them 

 to be acted on quite directly by germicidal agents. 



3. As yet very little work has been done in testing the effect 

 of germicides on streptococci. 



4. The most efficaciotis of the germicides tested are as follows: 

 alcohol, 50 or more per cent; chloramin-l' ; dichloramin-T ; 

 iodin ; merctiric chlorid and thymol. 



5. Certain commonly employed germicides as boric acid and 



