306 THE BIOLOGY OF STENTOR 



of Weisz (1948a, 1954). I have found, however (Tartar, 1953, 

 i959g), that in whole cells with only one node, appearance of the 

 regeneration primordium is very much delayed, substantiating an 

 early remark of Popoff (1909) regarding slowness of regeneration 

 in animals with a decreased nucleo-cytoplasmic ratio. In grafts of 

 two animals carrying only one node the delay was greater ; primor- 

 dium formation occurred only after two days, with development 



Fig. 86. Effects of marked shifts in the nucleo-cytoplasmic ratio. 

 A. Indication of disturbance in hypernucleates. a: Fragment 

 containing all the macronucleus (20 nodes) of a coeruleiis did not 

 regenerate until one day later and then astomatously {b). c: By 

 day 3, successful re-regeneration had occurred and specimen 

 still had 17 to 20 nodes, d: Next day there were 10 oval or 

 doublish nodes indicating fusion and reduction of surface, e: 

 Specimen became sickly and died on day 5, a day earlier than 

 demise of the enucleate cell remainder. 



