64 



THE RISE AND FALL OF BACTERIAL POPULATIONS 



NUMBER OF 

 BACTERIA IN 

 I.C.C. 



1,000,000 



900^000 



600,000 



700,000 



6oo>ooo 



500,000 



400,000 



^00,000 



2 00,000 



100,000 



o 



10 



20 



30 

 DAYS 



40 



50 



60 



Fig. 2. — Multiplication of bacteria in bottled samples of certain spring waters (Miquel 

 [Frankland, 1894]). 



