174 



ANIMAL AGGREGATIONS 



TABLE IX 



Showing Division Rate of Sets of 4 Paeamecia Transferred Singly, in Two's, 



AND IN Four's, to 20 Drops of Bacterized Medium. Washed 



Twice in Bacterized and Once in Alkalinized Medium 



(Data from Petersen) 



TABLE X 



Showing the Effect of Double Washing and Transfer of Paramecia 



to 20 Drops of Alkalinized Bacterized Medium 



(From Petersen) 



