226 



THE BIOLOGY OF STENTOR 



2. Other disarrangements of the normal cell pattern 



When gross parts of the stentor cell are shifted with respect to 

 one another in operations much more simple than total mincing, 

 the effects on form are usually far more enduring and bizarre. 

 Original longitudinal and transverse axes are apparently retained 

 in the large parts and fall into conflict with each other. Gruber 

 (1885a) had shown that in stentors suffering a single cut the parts 

 could shift upon each other to produce doublish forms, and 

 Ishikawa (1912) produced these and large lateral flanges by slicing 

 into coeruleus and holding the split parts separated for a few 

 minutes so that they then did not heal in place. Here we shall 

 simply offer two new cases which are typical. 



Figure 65A shows a coeruleus which was simply split longitu- 

 dinally yet it never recovered the normal form before it eventually 

 died of starvation. The other case (b) was of a stentor which had 

 been " quartered " with the result that each fourth of the cell was 

 maximally misplaced. Gross abnormality resulted, finally leading 

 to the formation of a double animal. In a previously cited case the 

 same operation produced a doublet with reversed asymmetry on 



Fig. 65. Gross abnormalities of shape produced by simple shifts 

 of large stripe areas. 



A. When stentor is split to tail-pole, and halves shift by 

 contraction, healing irregularly, aberrant form is produced but 



later corrected. 



B. Anterior half rotated 180° on posterior then left half 180° 

 on right. Quartered animal became very abnormal in shape, 



later converting to a telobiotic double stentor. 



