. The dynamics of living matter . Fig. 63. water. This observation seems to indicate the possibility that the pro- cesses of organization are reversible, in some cases at least. Giard and Caullery have found that a regressive metamorphosis occurs in Synascidians, and that the animals hibernate in this condition. The muscles of the gills of these animals are decomposed in their indi- vidual cells. The result is the formation of a parenchyma which con- sists of single cells and of cell aggregates resembhng a morula.* Driesch found that when he isolated Clavellina that part of the ani- mal contai
. The dynamics of living matter . Fig. 63. water. This observation seems to indicate the possibility that the pro- cesses of organization are reversible, in some cases at least. Giard and Caullery have found that a regressive metamorphosis occurs in Synascidians, and that the animals hibernate in this condition. The muscles of the gills of these animals are decomposed in their indi- vidual cells. The result is the formation of a parenchyma which con- sists of single cells and of cell aggregates resembhng a morula.* Driesch found that when he isolated Clavellina that part of the ani- mal containing the gills underwent a retrogressive transformation simi- lar to that observed by Giard and Caullery, and that afterward these masses gave rise to a new The phenomena observed by * I quote this after Driesch, Archiv fur Entwickelungsmechanik, Vol. 14, p. 247, 1902. t Driesch, loc. cit.
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