BIOTIC STREAM RESPONSES TO STREAM REAERATION 



39 



Graph 2. Aerobic bacteria per milliliter plotted as logarithm of the count. 



Two and one-half liter plankton samples were concentrated by means 

 of a continuous-flow centrifuge and analyzed in accordance with Standard 

 Methods of Water Analysis so that results could be expressed as popula- 

 tion per milliliter and as volumetric standard units. 



The trend curve for total volume (Graph 3), expressed as volumetric 



— 2M 



— ?00 

 -180 



— 160 S 



— uo J 



—120 « 



—100 3 

 —to S 



I 



—60 £ 



—40 



— 20 



Pluktoe la 



TeluMtrle SteaUrd 



UatU P«r Ml. 



Total PUsktoa 



