INFLUENCE OF ENVIRONMENT 245 



TABLE VII 



Microscopic Plants and Animals Found in Water from 

 Pool in Union County {1925) 



1925 Plants and Animals 



Date No. Plants Protozoa 



3/17 3 Euglena acus 



Trachelomonas 



volacina 



Small green flagellates 



(Rotifers) * 



3/31 9 Algal spores Small flagellates 

 of Dinobryon Euglena acus 



Trachelomonas 

 Synura 

 Amoeba 

 Dinoflagellates 



Minute flagellates 



Synura 



Euglena 



Dinoflagellates 



Chloromonas 



Minute flagellates 

 Colpoda 

 Vorticella 

 Euglena 



Minute flagellates 

 Trachelomonas 

 Euglena 

 Heteronema 



Oxytricha 

 Minute flagellates 

 Trachelomonas 

 Euglena 



Diatoms and 

 green algae 

 Small flagellates 

 Trachelomonas 

 (Large numbers of 

 Cyclops) 



6/23 50 Closterium Minute flagellates 

 Diatoms Trachelomonas 



(Cyclops) 



4/14 21 Diatoms 



Tribonema 



4/28 26 Diatoms 



5/12 33 Minute 



unicellular 



Alga 



Diatoms 



5/26 39 Diatoms 



6/9 46 



Remarks 



Enough food for short 

 time, up to 50,000 per 

 of organisms 



Life fairly abundant 



cc. 



Very little life — not 

 sufficient apparently for 

 larvae 



Hardly sufficient food 

 supply 



Enough food 



Not enough food 



Not enough food 



Very little life 



