抄録
1) The pupilloconstricting action of the trigeminal nerve of bull-frogs is confirmed on physiological experimentations with Kotsuka's “glycerine spot method”.
2) It is revealed on physiological experiment with “glycerine spot method” and nicotine method (Lagley & Dickinson) that the trigeminal pupilloconstricting fibers of bull-frogs have their cell-stations in the ganglion prooticum commune.
Thus the trigeminal pupilloconstricting fibers are the true efferent pupilloconstricting fibers.
3) above experimental results are presented to disapprove Langley's law of double innervation of the centrifugal autonomic nerves on the iris.
