In order to investigate which role the retina plays in the visual perception of form, three kinds of experiments were made to record the surface-potentials from the isolated carp retina receptor surface. The potentials are the responses to a light-spot projected inside and around the stimulus-figure (triangle). These responses as functions of dark- and light-adaptation, distance, luminous intensity and rotation of the figure can be interpreted as follows: (1) The suppressive effect of the figure on the area projected by the light-spot decreased as the distance between the figure-center and the light-spot increased. (2) During light-adaptation, the break-locus of the potential-polarity (zero-potential-line} approached the stimulus-figure. (3) Continuous figure-rotation permitted clear identification of potential-amplitude variations corresponding to critical figure-components passing the recording site. The results were related to the psychological potential-field of form perception.