In an attempt to determine whether or not the blindspot of Mariotte as represented on the standard campimeter chart is appropriate for studies with minute test objects, such as those used in angioscotometry, it was decided to analyze a series of 100 blindspots of "normal" subjects. This seemed particularly necessary because of the great variation in the technics employed by previous workers1 whose figures have been used as standards for the location and dimension of the blindspot on standard instruments, such as the tangent screen, the campimeter and the stereocampimeter. The material studied was obtained by permission of Dr. John N. Evans2 and was selected from the records of his private patients. Only those subjects were accepted who had undergone a careful general physical and ophthalmic review and who showed no evidence of nephritis, arteriosclerosis, sinal disease, myopia, tumor of the brain, optic neuritis, medullated nerve fibers, etc.