396 



RUTH J. STOCKING 



Fig. 2 One of the individuals (,15a) of Experiment 1 which never divided, 

 showing the decrease of size and change of form it underwent from December 9 

 to December 15, inclusive. (X 100) 



Fig. 3 Two of the individuals of Experiment 1 which never divided, showing 

 the changes*of form and size they underwent. The two figures at the left show 

 16a on December 9 and 11; the other two figures show llOa on December 9 and 

 13. (X 100) 



Fig. 4 Three of the individuals of Experiment 1 which never divided The 

 first two figures show 52a on December 9 and 13; the second two figures show 

 89h on December 9 and 13; the last two, 19b on December 9 and 11. (X 100) 



