CONJUGATION IN PARAMECIUM 
289 
Fig. 4 Outlines (drawn with projection apparatus) showing characteristic 
changes in form and size as conjugation is brought on. Row A, specimens from 
the old culture, without fresh food, at the beginning of the experiment; no con- 
jugation. B. Specimens from same lot after 24 hours in hay infusion; no conju- 
gation. C, Same after three days in the same hay infusion, which is getting old; 
conjugation beginning. 
