. The dynamics of living matter. Reproduction; Regeneration (Biology); Biochemistry; Reproduction; Biochemistry. 204 DYNAMICS OF LIVING MATTER was made from a different point of view independently by Godlewski.* Through the Hgature the current which carries away substances from the aboral end is inhibited, and hence the cause for the polarity is removed. When I first made these experiments the hypothesis of Sachs seemed to suggest that in the excised piece of a stem not enough specific polyp- forming material was present to allow the simultaneous forming of two polyps, but the experiments alre
. The dynamics of living matter. Reproduction; Regeneration (Biology); Biochemistry; Reproduction; Biochemistry. 204 DYNAMICS OF LIVING MATTER was made from a different point of view independently by Godlewski.* Through the Hgature the current which carries away substances from the aboral end is inhibited, and hence the cause for the polarity is removed. When I first made these experiments the hypothesis of Sachs seemed to suggest that in the excised piece of a stem not enough specific polyp- forming material was present to allow the simultaneous forming of two polyps, but the experiments already mentioned exclude this idea. It is further excluded by the observations made by Miss Bickford, who found that even if a stem be cut into a number of small pieces, each oral end of such a piece forms a polyp. Hence it is not a question of lack of material but only a lack of free cut ends, which block the flow of sap, if only one polyp is formed in a piece cut from the stem of a Tubularian. It is therefore apparently the process of streaming itself which may take something away from the aboral end, which is responsi- ble for the fact that a stolon is formed here, or if a polyp be formed that its formation is delayed. As far as the method of regeneration is concerned, Miss Bickford has found that it does not consist in the growth of a new polyp from the old material, but in a direct transformation of the material of the stem into a new polyp. Miss Bickford observed this directly under the microscope in small pieces from the stem of a Tubularian, which were not even of the size of a normal polyp. In such cases the whole mass of the piece was transformed into a In the case of the smallest pieces the result was still more striking. At each free end of the small piece of the stem tentacles and a proboscis were formed (Figs. 43 and 44), but inasmuch as there was no material left for the formation of a stem in addition to two polyps, or not even for two entire polyps, a kind
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