274 



C.-E. A. WlNSLOW AND E. E. LOCHRIDGE 



TABLE 6. 

 ACTION OF ACETIC ACID ON B. coli IN TAP WATER. 



TABLE 7. 

 ACTION OF BENZOIC Aero ON B. coli IN TAP WATER. 



TABLE 8. 

 ACTION OF BENZOIC Aero ON B. typhi IN TAP WATER. 



the 100 per cent reduction at 0.0935 normal. The acid at these 

 strengths is only a little over i per cent dissociated, and the amount 

 of dissociated hydrogen present a little over 1.2 parts per million. 

 Since this is only about one-sixth the strength of ionic hydrogen 

 necessary to produce similar results with the mineral acids, it is evi- 

 dent that the toxic action of the acetic acids is due chiefly to the anion 

 or the undissociated molecule, the latter, being so much greater in 



