6 Ethel Nicholson Browne 
outpushing had increased and two new tentacles were just begin- 
ning to grow out from its distal end beside the grafted tentacle 
(Fig. 10). ‘The grafted tentacle had decreased in size noticeably. 
This outgrowth was distinctly different from that observed when 
the tentacle was grafted in the middle of the stock, being much 
smaller in circumference. On the next day, March 8, the out- 
growth could be clearly recognized as a minute hydranth with two 
short tentacles and one longer one, the grafted tentacle, which had 
become still further reduced in size by absorption (Fig. 11). In 
the afternoon of the same day, this small hydranth pinched off 
from the stock. On March 11, owing to the further absorption of 
the grafted tentacle and the further growth of the two regenerated 
tentacles, this hydra appeared as a typical hydra of very minute 
size, with three tentacles of about equal length arranged about the 
hypostome (Fig.12). “The volume of the small hydra was not more 
than one-tenth that of the stock from which it pinched off. In 
several other similar experiments, the same history followed except 
that the small hydra separated with only two tentacles present, the 
grafted one (reduced in size) and one regenerated one. In these 
cases, a third tentacle usually appeared after the hydra had pinched 
off. In still other similar experiments, there were no new regener- 
ated tentacles formed, but the small hydra pinched off with only 
one tentacle, the grafted one (Fig. 13). One or two tentacles were 
formed, however, after the small hydra had separated. 
Result 2. In two out of about twenty grafts in the foot region, 
the tentacle grafted was slowly absorbed. 
Result 3. In two other cases, abnormal hydras resulted from 
the graft of a tentacle in the foot region. An outgrowth from the 
foot carried the grafted tentacle along with it, as though to form a 
new hydranth (Fig. 14). But the tentacle was absorbed while the 
outgrowth enlarged, and no separation took place before the end 
of two weeks when these abnormal hydras died (Fig. 15). 
Series III Graft Made in Circlet of Tentacles of Stock 
The insertion of a tentacle into the circlet of tentacles of a normal 
hydra in no instance induced the formation of a new hydranth. 
The tentacle either remained as grafted or instigated the outgrowth 
