300 THE BIOLOGY OF STENTOR 



have found that heaHng is prompt and to all appearances as good 

 in enucleates as in nucleated stentors. 



In regard to shape recovery, Balbiani (1891c) had observed that 

 enucleate aboral longitudinal halves which folded on themselves 

 retained the abnormal shape; nucleates recovered. From less 

 drastic distortions, Prowazek (1904, 1913) and Schwartz (1935) 

 reported that enucleates are capable of rather extensive reconstitu- 

 tion of the normal axis and conical form. This was my experience 

 also (Tartar, 1956c) and can be explained as merely the shifting 

 in position of parts already present without requiring new 

 syntheses. Schwartz observed little or no reahgnment of the striping 

 of the ectoplasm, however, and made the point that, since these 

 adjustments are gradual, the enucleated cell dies before they can 

 be completed. I have found that separate or separated membra- 



F1G.85. Activities during survival of enucleated (minus 

 macronucleus) S. coeruleus. 



A. Mass of 2 enucleate stentors minced and mouthparts 

 removed. Sections of membranellar bands come together and 

 join and there is considerable mending and alignment of stripe 



areas. Specimen lived 5 days. 



B. Stage-4 reorganizer enucleated. By day 2 of the experi- 

 ment the anlage had lengthened but there was no stomatogenesis 

 and original mouthparts were resorbed. By day 3 specimen was 

 about half original volume, indicating utilization of its substance 

 during starvation. Considerable fading of coloration occurs. On 

 day 4 lateral striping is present but only a few membranellar cilia 

 remain. Day 6 : glistening sphere without body or oral cilia but 



with vestiges of striping, found dead on day 7. 



