Rate of COg production 



100-- 



50- 



o o.osn 



O.OSand 

 0.01 N 



o,5n 



l.OM 



1^ 

 





40 



6omin. 



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

 per cent of the normal) in 0.03, 0.05, 0.01, 0.5, and 1.0 m MgCl2. The zero 

 point on the abscissa denotes the beginning of exposure to the salt solution; 

 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 curve represents a single 

 typical experiment. 



332 



