TRANSFORMING AND REGENERATING ORGANS 633 



of absorption. I do 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, b c, 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 i, which was transformed 

 into a mass of undiff erentiated . 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, c d. Then a new polyp, h, began 

 to rise on the upper surface of the 

 stem. It grew at right angles toward 

 the watchglass, a point which cannot 

 be rendered accurately in the draw- 

 ing. A new stolon, a b, 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, c d. 

 At the time the drawing was made 



FIG. 156 



