FIG. 2. Diagram representing the various stages in the process of conjugation 

 and of the following reconstruction of the macronucleus in Paraniecium. From 

 Arnold Lang's Lehrbuch der Vergleichenden Anatomic. Ma, macronucleus of the 

 conjugant; Mi, micronucleus of the conjugant; a 1 , 6 1 , stationary micronuclei; a*, bz, 

 migrating micronuclei; aib^, a-ibi, synkarion; I, the two conjugants A and B; II, 

 the four individuals of the second generation produced by the transverse division of 

 the exconjugants; III, the eight individuals of the third generation, each with a 

 single macronucleus and micronucleus; the crown indicates the disintegration of 

 the corresponding nucleus. 



Instructions 



i. Put a small drop of hay infusion containing live Paramaecia 

 on a slide, add a small drop of quince seed jelly, cover with 

 a cover glass and examine under low power (100 diameters). 

 When the animals have quieted down examine a paramsecium 

 under higher power (200 diameters) and make a drawing show- 

 ing outline of body, peristome, cilia, pulsating vacuoles, food 



