40 



BACTERIA IN WATER 



i-H O 



CO rH 



OO i-H 



r-( t-- 



CO I-H 



T-( lO 



CO ,-1 



rH CD 



ai 



3 O. 





il 



(U ^ 



^ ^ s 





a § 



^ V 



H 



H^4H I ' N 

 o o.« 



S 3^ 



=ij to " o. 



" §1 § 

 (y P > m 



13 g « O 



^ L§ S 



.£h H cfl rt 



■S^H a 



T< in 



H 



1 



p s oj 



^ » O. 



^ g S S 



-also 



g ? S B • 



S rt rt 43 



OJ Q^ Lj B ■)-> 



=4H to ""a 



1- g " S 



15 



^ Jo . 



-ass's 



I I i i ■ 



1 "^ j_»^— ' CO 



^ T! CO V 



a p 





BiJ 

 3 o< 



1^ 



'53 ."3.5 



(U to <u g 

 (M a 



(3 S 



a si 



^ a 



ce to 



