T909] LIPMAN—EFFECTS OF SALTS ON BACILLUS 109 
utes, and further, that even at a dilution of 0.0001 m NaCl proved 
poisonous to the young plants. The results above given serve, how- 
ever, to confirm again the general principle, formulated by Logs, 
of the toxicity of NaCl alone for living organisms. 
Fic. 1.—Toxicity curves of KCl, NaCl, MgCl,, and CaCl,. The ordinates rep- 
resent milligrams of ammonia nitrogen. The ordinate at o represents the amount 
of ammonia nitrogen formed in a blank culture (x per cent. peptone in distilled water). 
The abscissae represent concentrations in tenths molecular. 
SERIES Il. CALCIUM CHLORID 
Here the experiment was carried out in the same general way as 
i series I, CaCl, being substituted for NaCl, and, owing to the 
extreme toxicity of the former, solutions ranging from 0.1 m to 0.6 m 
only were prepared. The ammonia was determined as above and the 
results are shown in table II. 
