12 Periodicity in Active Numbers of Soil Flagellates 



S25 

 S20g 



«15° 



15 22 29 

 October 



12 19 26 

 November 



10 17 24 

 December 



31 



14 21 28 

 January 



Fig. 1. Numbers of active flagellates, amoebae and bacteria per gramme of soil and 

 percentage of moisture in Broadbalk, plot 2, from October 8, 1919 — January 28, 1920. 

 Bi-montbly countings. 



50' 



45 c 



40' M . 



1 -o 



0-9 



S 0-8 



•g 0-7 



.s °'* 

 a 0-5 



9 °' 4 



3 



M 0'3 

 0-2 



o-i 



8 15 22 29 5 12 19 26 3 10 17 24 31 7 14 21 28 

 October November December January 



Fig. 2. Eainfall and ground temperature from October 8, 1919— January 28, 1920. 



