200 THE AMERICAN NATURALIST, 
which had borne the small knob characteristic of the repro- 
ductive polyp showed, in three days, a remarkable. develop- 
ment of tentacles like those on a nutritive hydranth, as 
shown by z£, Fig. 6. Two small knobs (£.) are. present 
below the ring of tentacles, and these may— or may not — 
represent those of the original reproductive hydranth. A 
few large generative buds had been removed. from the polyp, 
but two remained as seen in Fig. 6, g. The polyps seemed 
vigorous, but possibly the presence of the generative buds 
caused an early disintegration. At all events, they all died 
before any new polyps were formed. by the stolons. What the 
condition was which brought about this change was not deter- 
mined, but it seemed possible that the formation of stolons 
might be connected with the. development of nutritive tentacles. 
The growth of stolons i in this case (Fig. 6) was more rapid than 
in that of other reproductive individuals in which the nutritive 
tentacles did not develop. In other instances the reproductive 
heads may have lost the power of developing the long tentacles 
when the stolons were late in appearing. A clearing up of 
this point might throw light on the experiment described above 
(Fig. 4), in which a piece of a reproductive stalk grafted to a 
nutritive polyp regenerated a nutritive head. The reproduc- 
- tive head had not been removed until the day following the 
graft, and the stolons developed at the same time that the head 
was regenerated. The regeneration of the nutritive head might 
have been influenced by the developing stolons. 
It gives me pleasure to acknowledge my indebtedness to 
Prof. T. H. Morgan for — suggestions during the course of 
this work. 
SMITH COLLEGE, 
NORTHAMPTON, MASSACHUSETTS. 
