68 



M. E. COLLETT 



TABLE 1 

 Organic acids alone and combined with HCl 



Formic 0.0005 N>.. 

 Formic 0.0002 N... 

 Acetic 0.0005 N... 

 Acetic 0.0002 N. . . 

 Propionic 0.0002 N 

 Butyric 0.0005 N. 

 Butyric 0.0002 N. 

 Valeric 0.0005 N.. 

 Valeric 0.0002 N.. 

 Caproic 0.0005 N. 

 Caproic 0.0002 N. 

 Benzoic 0.0005 N^ 

 Benzoic 0.0002 N. 

 Salicylic 0.00015 .. 

 Lactic 0.0001 N. . . 

 Tartaric 0.0001 N. 

 Citric 0.0002 N ... 

 Citric 0.0001 N ... 

 Lactic 0.0002 N... 



pH 



3.7 

 3.8 

 4.1 

 4.1 

 4.2 

 4.0 

 4.1 

 4.0 

 4.1 

 4.0 

 4.1 

 3.6 

 4.1 



3.9 

 3.9 

 4.0 

 4.3 

 3.5 



B 



3.4 

 3.7 

 4.0 

 3.9 

 4.1 

 3.9 

 4.0 

 3.9 

 4.0 

 3.9 

 4.0 



4.4 

 3.6 

 3.5 

 3.9 

 4.0 

 4.5 



3.9 

 3.9 



3.8 



3.9 



3.9 

 3.6 

 3.7 



3.5 

 3.5 

 3.6 

 3.7 

 3.2 



LENGTH OF LIFE IN MINUTES 



Paramecium 



Euplotes 



4 



> 2 



10 

 14 



7 

 13 



7 

 13 



7 

 12 



3 

 10 



2 



8 



8 

 15 

 70 



O A 



10 

 15 

 35 

 40 

 70 

 28 

 60 

 29 

 50 

 28 

 55 



2 

 20 



6 

 10 

 10 



120 

 6 



9 



13 



33 



40 



70 



27 



50 



25 



60 



30 



55 



2 



9 



7 



8 



7 



8 



20 



6 



6 

 12 

 33 

 30 



85 



23 



35 



23 



45 



30 



60 



2 



8 



6 



8 



8 



8 



22 

 25 



17 



19 



19 



6 



HCl 2. 



pH 



3.24 



3.54 



3.85 



4.14 



4.14 



4.74 



5.05 



5.6 



6.6 



7.0 



7.7 



8.4 



8.5 



LENGTH OF LIFE 



Paramecium 



2 



3 



4 



9 



20 



35 



40 



120 



140 



Or, 



Euplotes 



4 



5 



5 



7 



12 



170 



180 



180 



20h 



20h 



18h 



170' 



'Formic to caproic, organisms washed in pond-water. 

 2 Benzoic to lactic, organisms washed in distilled water. 



