A cerebral cortical projection area of the cerebellar paraflocculus,covering the anterior part of the middle ectosylvian gyrus ("focal field"), the anterior ectosylvian and sylvian gyri bilaterally, and the posterior ectosylvian, anterior suprasylvianand coronal gyri contralaterally, has been mapped out by means of the evoked potential method. Parafloccular projections turned out to be predominantly contralateral but definitely bilateral. On the ectosylvian cortex the evoked potentials appeared in form of a positive-negative sequence, usually, with latency of 7-12 msec. Local application of novocaine to the surface of the stimulated parafloccular folium was found to abolish the evoked potentials in the cortical projection area, the effect being constantly reversed by repeated washing.