4 Ethel Nicholson Browne 
ever, the new hydranth grew longer than in the case described, so 
that it was of about the same length as the original head. 
The axial relations assumed by the new head in reference to the 
common foot were not constant for even the same hydra at differ- 
ent times. [he new head was sometimes at right angles to the 
stock hydra, it sometimes formed a right angle with the foot and a 
straight line with the original head, it sometimes formed an obtuse 
angle with the foot making a Y-shaped structure, and it was some- 
times at an acute angle with the foot forming a X-shaped figure. 
The new hydranth never showed any tendency to travel toward the 
aboral end of the stock hydra. ‘This is of interest in connection 
with Miss King’s experiments in grafting whole heads into the 
side of stock hydras. As a result of her work, she found that the 
graft either separated from the stock in from 14 to 22 days, or 
migrated toward the foot region and separated in from 5 to 7 weeks. 
These two modes of separation are due, she concludes from her 
experiments, to the “axial relations assumed by the components 
of the graft.” If the graft remains at right angles to the trunk, 
separation takes place without migration; if the graft forms a 
Y-shaped structure with the stock, it migrates toward the aboral 
end before separating. [he new hydranth that is formed in my 
experiment seems to act quite differently. It has no definite 
axial relations with the stock and does not migrate toward the 
foot. As to the final separation of the regenerated hydranth from 
the old stock, I can say nothing, for I have not succeeded in 
keeping these grafts more than a month after operation, and they 
have not separated within that time. — 
Result 2. In one case grafted February 19, after a slight 
outpushing of the body wall around the grafted tentacle and the 
formation of three additional tentacles (Fig. 5), a process of absorp- 
tion set in. On the seventh day after operation, the projection of 
the body wall to form a new hydranth was no longer visible, the 
four tentacles emerging directly from the body of the stock (Fig.6). 
Four days later, one of the four tentacles was absorbed, and just 
below the place where the tentacles were present, a small protru- 
sion on the body wall was noticed (Fig. 7) which on the following 
day could be definitely determined to be a bud (Fig. 8). The 
