266 R. \V. HEGNER. 



Experiment 18. Three stems bearing 7, 4 and 3 bladders respectively were 

 placed in a culture containing //. acus. Twenty-four hours later specimens had 

 been captured by 2 bladders on the first stem, 3 on the second and 3 on the third. 

 Daily examinations were made for 5 days. During this time the flagellates retained 

 their normal activities but apparently did not increase in numbers. 



Phactis longicandus is not injured by bladders and may multiply 

 in bladders. 



Experiment 28. Twelve bladders on three stems were inoculated with from one 

 to 7 specimens each of P. longicaudus. These specimens retained their normal 

 appearance and activities. At the end of 7 days an increase in the number of 

 specimens was noted in at least s bladders; these contained 6, 7, 8, n, and 25 

 specimens each. 



Stentor polymorphus is captured and killed by bladders. 



Experiment M. i. One stem bearing 8 large and many smaller bladders was 

 placed in a culture containing many specimens of S. polymorphus. Twenty-two 

 hours later one bladder had captured 2 and another bladder one specimen. Two 

 of the stentors were still alive with cilia moving but were abnormal in shape, the 

 third had become spherical and quiescent. 



Experiment M. 2. Seven detached bladders were inoculated with stentors; 2 

 with one, 3 with 3, one with 4, and one with 6 specimens. Eighteen hours later the 

 stentors in 3 of these bladders (7 stentors in all) had died and disintegrated; those 

 in 2 bladders (5 specimens) were still active; and those in 2 bladders (9 specimens) 

 were not active and abnormal in shape. One stentor remained active for 42 hours 

 but all were dead and had disintegrated by the end of 66 hours. 



Stylonychia pustulata is captured and killed by bladders. 



Experiment M. 5. Twelve large detached bladders were placed in a culture 

 containing many specimens. Four hours later 5 had captured i, 2, 2, 3 and 4 

 specimens respectively. These had all disappeared 20 hours later. 



Experiment M. 3. Eleven large detached bladders were inoculated each with 

 a few specimens. Some of these were still alive and active 3 hours later. All but 

 2 specimens in one of the bladders had disappeared 20 hours later. 



Experiment M. 4. Eleven large detached bladders were inoculated with from 

 one to 10 specimens each. Four hours later active specimens were noted in only 

 5 bladders, and 20 hours later only one specimen was found in one of them. 



Colpidium colpoda is captured and may live from 7 to 24 hours or 

 more. In seven experiments the culture used contained not only 

 paramecia or stylonychias but also C. colpoda. The reactions of 

 the latter were incidentally recorded. 



Experiment M. 3. Specimens of Colpidium were still alive in 8 of II detached 

 bladders that had been inoculated 23 hours previously. 



Experiment M. 4. Specimens were alive and active in all cases 24 hours after 

 inoculated into n detached bladders. 



Experiment M. 7. C'olpidia were captured by all of 19 detached bladders but 

 had disappeared in all but 2 seven hours later. 



