An understanding of the relations of the central visual system of animals will doubtless aid our appreciation of the precise conditions in the human brain. The visual pathways of animals can be accurately determined by the study of experimentally produced degenerations, as is shown by the experiments of Minkowski1on the geniculocortical connections in dogs and cats and the experiments of Brouwer2and Zeeman3on the representation of the retinal quadrants in the corpus geniculatum laterale and anterior corpus quadrigeminum of the rabbit, cat and ape. In order to complete our knowledge of the anatomy of the visual system in the rabbit, the experimental investigation of the projection of the corpus geniculatum on the cortex seemed desirable. It is unnecessary to review completely the history of the discovery of the central visual connections in animals, as this is well covered in the papers just cited. Apparently the