No. 423.] HYDRACTINIA AND PODOCORYNE. 197 
individuals are organically connected, it seemed at the out- 
set possible that, under certain conditions where a complete 
union was effected, the subsequent regeneration might be 
modified. This seemed especially likely to occur if the 
nutritive.polyp, which is the more vigor- 
ous and the less specialized of the two, 
formed the larger component. Repeated 
attempts were made to leave as small a 
portion of the reproductive stalk as pos- 
sible attached to the nutritive compo- 
nent, but, with one exception, none were 
obtained in which the regenerated head 
showed the influence of the nutritive 
polyp. The result is. the. same when | ` e | 
the direction: of the two components is | 
reversed, as in Peebles's experiments, 
and when it is the same, as in most of 
my experiments (see Figs. 1, 2, and 3). 
All regions. of the stalk 
from which the components 
are taken seem equally un- 
able to influence the sub- 
sequent regeneration or to 
be influenced by the union. 
It was also found that the 
regeneration following a 
graft of this sort is no 
more easily influenced Frc. 4.—x 45. The aboral end of a reproductive polyp 
when the reproductive a ta ee ove bed Ga ei ci Ja ly 21, 
component is taken from Soror o oe doe ca ue WA vise 
an immature polyp than WR stalk and cages tentacles A age = the 
when it is taken from an (at) had also developed on the aboral end of the nutri- 
tive stalk attaching it to the disk. (Drawn July 23.) 
adult. 
"An interesting and solitary exception to these results is 
illustrated in Fig. 4. A nutritive polyp (#.) and a reproduc- 
tive polyp (r.) were grafted as in the preceding cases, and on 
the following day the reproductive head was removed, leaving 
only a small part of the reproductive stalk attached. A day 















