Il6 DYNAMICS OF LIVING MATTER 



brought from the ocean to the aquarium, the old polyps die in a few 

 days. If the aquarium is exposed to sufficiently strong light, new polyps 

 are formed, while this formation does not occur in weak light or the 

 dark. It seems, however, as if the formation of stolons could occur 

 also in the dark. The different parts of the visible spectrum are not 

 equally effective. Behind screens of red glass the formation of polyps 

 was less favorable than behind screens of blue glass, even if the degree 

 of brightness of both kinds of glass seemed to be the same. 



