Hubert M. Morris 



287 



these were obtained. The soil temperatures were registered by a recording 

 thermometer at a depth of six inches. 



These records have been preserved but are not considered in the 

 present instance. 



The total rainfall during the period February 1st, 1920, to January 

 29th, 1921, was 26-459 inches. 



Millions Millions 



per acre per acre 



Manured Control Manured Control Manured Control Manured Control 

 Iiisecta Myriapoda Oligochaeta Acarina 



(Terricolae) 



Fig. 4. Number of individuals in the more important groups in the manured and 



control plots. 



5. Occurrence of Weeds. 



Plot 2. In the spring the most abundant weeds are Veronica hederae- 

 folia, Scandix pecten and Galium aparine, and in addition to these Alope- 

 curus agrestis and Carduus arvensis are plentiful. 



In the summer Scandix pecten and Galium aparine are still abundant, 

 and in addition to those occurring earlier, Caucalis arvensis, Equisetum 

 arvense and Tussilago farfara are plentiful, and later still Convolvulus 

 arvensis is also prevalent. 



