VITALITY 



2G5 



#^4#jv 



Fig. 136. — Paramecium caudatum, merotomy. 1, 2, and 3, different experiments, 

 the straight line indicating the plane of cutting; 3, the history of a monster: an 

 original cell (3a) was cut as indicated; the posterior fragment (b) divided (c) into (d) 

 and (e), the latter formed a monster (3, / to o); enucleated individuals (h, k and n) 

 occasionally separated from the parent mass. (After Calkins.) 



