168 PROTOZOAN PARASITISM 



Mercurochrome has also been recommended. 

 Davis and Colwell (1929) found it lethal to the para- 

 site in 5% solution practically immediately. These 

 authors also report that liniment of soft soap from 

 1% to 50% strengths kills the organism instantly, 

 that 10% glycerine kills within one minute, that 

 lactic acid stops motion in 2% solution within 45 

 seconds, that compound iodine solution has an in- 

 stant killing effect in dilution of 1 to 100, mercuric 

 chloride in 1 to 5000 solution and compound cresol so- 

 lution up to 1 to 400 solution, having the same effect. 

 It seems that there are a variety of therapeutic agents, 

 which will destroy the organisms, available for va- 

 ginal application and that persistent treatment may 

 be expected to eliminate them. The fact of elim- 

 ination must be carefully determined. 



