326 A. J. Gohifarb 



same degree, causing a slight increase at the oral end, and a con- 

 siderable increase at the basal end. Fifth, the influence that a 

 ligature exerts, does not, as a rule, affect the next lateral free end 

 to the same degree as the axial free end, particularly the basal free 

 end, even though such axial end is not nearest to the ligated branch. 

 Sixth, while the figures in the table are not absolute they show in a 

 general wav which arrangement and number of ligatures are more 

 eff^ective in bringing about an increased basal regeneration. 



Experiment g. We may now turn our attention to heteromor- 

 phosis shown by very small pieces of stems and branches. The 

 apical ends of a series of stems, mcludmg the distal two pedicels 

 and their polyps, were removed. The apical polyp was then cut 

 off. In one lot the lateral branch was ligated, in the second, they 

 were not ligated; in both the axial ends were equidistant from 

 the lateral pedicel. Polyps appeared at one or both ends either 

 simultaneously, or more frequently the basal end appeared one 

 day before the oral hydranth. Sometimes stolons were produced 

 at one or both ends. The basal ends regenerated more rapidly and 

 in greater numbers than the oral ends of these pieces. The actual 

 figures are as follows: 



Polyps regenerated 



TABLE 9 



on 2 days 3 days 4 days 



Oral ends o 17% 25% 



Basal ends 7 25% 45% 



The same results obtain when similar pieces taken from dif- 

 ferent regions of the stem are used. About three times as many 

 polyps are produced at the basal as at the oral ends in six days. 

 These facts indicate that very small pieces of stems, regardless of 

 the region from luhich such pieces are taken, tend to regenerate 

 a far greater number of heteromorphic polyps and to produce these 

 faster than oral polpys. 



The following three experiments give further evidence concern- 

 ing heteromorphic regeneration on small pieces from similar or 

 different levels of stems. 



Experiment 10. The apical ends of a number of stems and 

 branches were cut beyond the distal node. These pieces about 



