77 



K 



Fig. 82. Conjugation of Paramaecium caudatum. [A-C, after R. HKKTWIG; D- A", after 

 MAUPAS.] (The macronuclei dotted in all the figures.) 



A. Micronuclei preparing for their first division. D. Second division. C. Third division : 

 three polar bodies or " corpuscules de rebut," and one dividing germ-nucleus in each animal. D, 

 Exchange of the germ-nuclei. E. The same, enlarged. F. Fusion of the germ-nuclei. G. The 

 same, enlarged. H. Cleavage-nucleus (c), preparing for the first division. /. The cleavage- 

 nucleus has divided twice. J. After three divisions of the cleavage-nucleus; macronucleus 

 breaking up. K, Four of the nuclei enlarging to form new macronuclei. The first fission soon 

 tak<-s place. 



