TRANSFORMING AND REGENERATING ORGANS 633 
of absorption. Ido not consider it 
impossible that the phenomena of 
protoplasmic motion which we can 
actually observe in the growth of a 
stolon in Campanularia exist also in 
the phenomena of growth of other 
organisms, plants as well as animals. 
I have already called attention to this 
possibility in a former paper. 
Before we leave this subject I wish 
to describe how the nature of the 
contact localizes the development of 
polyps from stolons and stems. The 
piece, bc, Fig. 156, was cut out from 
a fresh Campanularia stem and had 
been put into a watchglass filled with 
sea-water. This piece had a normal 
polyp at 7, which was transformed 
into a mass of undifferentiated pro- 
toplasm and began to flow back into 
the stem. Simultaneously a new 
stolon began to grow out at c, and 
very soon reached the considerable 
size,cd. Then anew polyp, h, began 
to rise on the upper surface of the 
stem. It grewatright angles toward 
the watchglass, a point which cannot 
be rendered accurately in the draw- 
ing. A new stolon, ab, began to 
grow or creep out simultaneously at 
a. Curiously enough, as soon as this 
happened the protoplasm began to 
flow back from the old stolon, ¢ d. 
At the time the drawing was made 
FIG. 156 
d 
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