FEEDING PARAMECIUM KNOWN BACTERIA 



157 



T.\BLE 3c 



SummarTj of results for period III, from December 5, 1920, to December 28, 1920. 

 Food and media as in table 3b 



TABLE 3d 



Summary of results for period IV, from January 12, 1921 to February 5, 1921. 



Food and medium as above 



TABLE 3e 



Summary of results for period V, from February 13, 1921, to March 7 , 1921. 



and medium as above 



Food 



1 Died and restarted after a week's interval, then died again. 

 ^ Started three days before end of period. Showed low vitality. 



Tables 3, a to e, demonstrate that the chance mixture M showed 

 a steady decHne in all factors considered. This decline, however, 

 was not evident during the daily course of the work, for, as the 

 graphs show, such fluctuations as occurred would naturally be 

 attributed to normal rhythms, and were not noticeably different 

 from those occurring in the artificial mixtures. It was only 

 when all evidence was collected and the final averages made that 



