338 



STUDIES ON RESPIRATION. XIV 



of the lower concentrations cannot be clearly shown in the figure 

 the results are given in Table I. 



Fig. 3 shows antagonism. In this figure the abscissae represent the 

 number of cc. of each component in the mixture; since the molecular 

 concentrations are the same for all the components the abscissae 



Rate of CO2 production 

 120%- ' 



100- 



0.000005 M 



*^ 0.000025 H 

 0.00005 n 



°0.05M 



^l.OM 







lo 



60min. 



Fig. 1. Curves showing the rate of respiration of Bacillus subtilis (expressed 

 as per cent of the normal) in 0.000006, 0.000025, 0.00005, 0.05, and 1.0 M La(N03)3. 

 The zero point on the abscissa denotes the beginning of exposure to the salt solu- 

 tion; previous to this the bacteria were in 0.75 per cent solution of dextrose in 

 distilled water. The normal rate (which is taken as 100 per cent) represents a 

 change in pH value from 7.78 to 7.60 in a number of seconds depending upon the 

 amount of bacterial suspension used, usually 30 seconds. Each experiment is 

 represented by a single curve. 



