IO Ethel Nicholson Browne 
was slowly absorbed so that after about ten days no trace what- 
ever of the graft was left. 
These experiments show that the graft of just the tentacle 
without peristome tissue at its base does not stimulate the regener- 
ation of a hydranth. 
Group D 
Peristome at Base of Tentacle Without Tentacle as Graft 
Methods 
In one set of these grafts, I cut off a tentacle with the peristome 
tissue at its base and inserted it into the body of the stock as 
described under Group A. ‘Then after the raw surfaces of the 
stock and graft had healed, I cut off the grafted tentacle close to 
the body wall, thus leaving grafted in the stock the bit of peristome 
tissue that was at the base of the tentacle. In another set, I cut 
off a circlet of tentacles, then cut off a few tentacles at their base, 
close to the circlet, and used a small piece of the remaining ring of 
peristome tissue. ‘This I grafted quickly into a previously pre- 
pared cut in the body wall of the stock. Both methods gave the 
same result. 
Series I Graft Made in Middle of Stock 
Result r. In three out of five cases tried, the graft in the middle 
region of the body gave rise to a new hydranth. ‘The outgrowth 
was similar to that initiated by the graft of a whole tentacle and 
peristome tissue at its base. The body wall of the stock at the 
region of graft pushed out and new tentacles were formed on it 
(Figs. 35-37). 
Result 2. In two other similar experiments, absorption took 
place and no regeneration occurred. 
Series IT Graft Made in Foot Region of Stock 
Result t. In two out of three cases in which the peristome tissue 
at the base of the tentacle was grafted into the foot region of the 
