SALT EFFECTS IN B.VCTERL\L GROWTH 



469 



acid reRion by the addition of 0.20m NaCl. It is possible that 

 this effect niip;ht be increased by usinp; a more dilute salt solu- 

 tion, and perhaps, in the same way, this effect might be produced 



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Mec/i'a -pH 



with organisms which thus far have failed to show any such 

 modification in their limits of growth. 



The same results which we have noted with NaCl may be 

 produced with other neutral salts, but the degree of the widening 



