1. A vasodilator nervous pathway to the cerebral vessels from the central nervous system. 2. On the occurrence of afferent nerve fibers in the internal carotid plexus.

Already Nothnagel's (1867) experiments made on vasomotor innervation of the pial arteries, lead him to suggest the presence of some ·other vaso-motor pathways from the central nervous system to the pial arteries than that represented by the cervical sympathetic trunk. He pointed to the cranial nerves, commnnicating with the internal carotid nerve, as the other possible routes for these vaso-motor nerve fibers. [...