(5) The dissociations of visual perceptions are analogous to those found in disturbances of somatic sensibility in cases of cerebral injury,, which have been so ably studied by Head and Holmes [3]. Certain of the cases bear incidentally on the question of the cortical representation of the macula, and one indeed also on the cortical representation of the peripheral zones of the retina. Visual defects are considered from the point of view of vision as a part of general sensation rather than a special sense; and I hope that my results will demonstrate that the elementary visual perceptions, of light, of movement, and of an object, are dissociated in a manner similar to the dissociation which is known to occur when sensory paths conducting primary somatic sensory impressions of touch, of pain, of temperature are interrupted. Moreover, the higher and more evolved