The dynamics of living matter . dynamicsofliving1906loeb Year: 1906 DYNAMICS OF REGENERATIVE PROCESSES 213 5. On the Influence of the Central Nervous System upon Regeneration and on Phenomena of Correlation in Regen- eration It is rather remarkable that the central nervous system plays an important role in phenomena of regeneration. In 1889 I noticed that in Thysanozoon Brochii, a marine Planarian, the isolated head containing the ganglia is capable of rapid regeneration while the body without the ganglia shows less, or a slower regeneration.* The taking up of food is not responsible for this
The dynamics of living matter . dynamicsofliving1906loeb Year: 1906 DYNAMICS OF REGENERATIVE PROCESSES 213 5. On the Influence of the Central Nervous System upon Regeneration and on Phenomena of Correlation in Regen- eration It is rather remarkable that the central nervous system plays an important role in phenomena of regeneration. In 1889 I noticed that in Thysanozoon Brochii, a marine Planarian, the isolated head containing the ganglia is capable of rapid regeneration while the body without the ganglia shows less, or a slower regeneration.* The taking up of food is not responsible for this difference, since the head cannot take up food. That the taking up of food is not essential for regeneration follows also from the observations on the regeneration of pieces cut from the walls^ of Cerianthus. We must not overlook the fact that the reversible chemi- cal processes in the cells of an animal are liable to provide material for regeneration in the same way as the taking up of food. A number of observers—T. H. Morgan, Child, Lillie, and Lillian Morgan — have since found that the oesophageal ganglia exercise a con- siderable influence upon regeneration in marine It is therefore obvious that there exists a typical difference be- tween fresh-water and marine Planarians, since in the fresh-water Planarians the presence of the oesophageal ganglia is not required for complete and rapid regeneration. This difference in the influence of the oesophageal ganglia in marine and fresh-water Planarians upon regeneration finds a probable expla- nation in a fact to which Bardeen has called attention; namely, that the longitudinal nerves which go through the whole body of the Planarians are very rich in ganglia in the fresh-water Planarians and very poor in gangha in Thysa- nozoon. Herbst has discovered the most beautiful case of hetero- morphosis thus far known; pj^_ herbst. namely, that in Crustaceans in the place of an eye which has been cut off, an ent
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