Occupation of the seclion onh- once a year, and noting a progressive 

 change from an earher condition through the years 1940 and 1941, 

 leaves us with too few data to pursue the matter further at this time, 

 but it will be of interest to determine whether observations taken in 

 postw^ar years show the change to be a temporary one or the beginning 

 of a long period trend. 



33 



