The Role of the Suboesophageal Ganglion upon the Pupal Diapause of Giant Silkworm, Samia cynthia pryeri

The effect of the transplanted brain or Br-SG complex on the termination of the pupal diapause of cynthia silkworm, Samia cynthia pryeri, was investigated in various cases. Neither the possibility that diapause factor was secreted from the suboesophageal ganglion of the diapausing pupa, nor the possibility that something activating factor to increase the effect of the transplants was secreted from the suboesophageal ganglion were exhibited in the results of these experiments. It seems to be explainable that the lesser effect of the transplants on the development of the pupa lacking in Br-SG was derived from the serious injury of the pupa