ON PROPAGATION OF CORTICLA FACTOR AND CYTOPLASMIC FACTOR PARTICIPATING IN CLEAVAGE FURROW FORMATION OF THE NEWT'S EGG*

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Abstract
From C. pyrrhogaster eggs just after the start of 1st cleavage, a fragment of cortical layer with a small entire cleavage furrow was cut out. In the fragment, the cortex already acquired susceptibility to furrow formation and the sucortical cytoplasm already acquired inducibility for it. The fragment was transplanted to the animal hemisphere of uncleaved fertilized eggs, or eggs immediately after onset of the 1st cleavage, from which a portion of the host cortex was removed. Observation was made on division of the graft, and on propagation of the cortical susceptibility and the cytoplasmic inducibility of the graft onto the host egg. The transplant divided successively on the host egg in many cases, but the furrow of the graft never advanced to the surface of the host egg. Neither the cortical factor nor the cytoplasmic factor was transmitted across the graft to the recipient egg.