The cue to the cure appeared when the child, in expressing his fear, complained because he could not see the parent who sat beside him on the bed. Upon lighting the room the child seemed pacified but still held tightly to anything within reach. As a rule the illusion disappeared within thirty minutes after illumination. It was then suggested that the child be put to bed in a well lighted room. This was done but the phenomenon reappeared although in a less aggravated form. Degree of illumination and intensity of the illusion appeared related. The phenomenon failed to appear at all when a coal oil lamp was placed beside the bed not over two feet from the child's head. For six months the boy went to sleep facing the full glare of the lamp. Gradually the lamp was removed until it occupied a position in the hall. Whenever the illusion recurred the lamp was replaced in its original position. It is quite probable that the intensity of the visual stimulus (the lamp) deflected the nervous current from the neural processes underlying the illusion and thus changed the direction of attention. Any intense distraction, other than the one employed, would probably have served the same purpose. At the end of a year and a half the phenomenon entirely disappeared. The second case is that of a six-year-old girl, the daughter of highly educated parents. With reference to this case two interesting phenomena were observed: (a) that of mirror-writing of the common variety and (b) that of ambiguous interpretation of the retinal impressions. The phenomenon of mirror-writing here observed parallels that of many other cases in which the left-right direction is reversed. These commoner cases take on an added interest when considered in connection with a case of double space inversion. Such a case is on record.[1] The double inversion consists in writing all verbal symbols and digits up side down and backward. In this case the boy had perfect pseudoscopic vision at the beginning of his school work. Stratton, by a system of lenses, artificially produces the same distortions and throws some light on the phenomenon.[2] [1] G. F. Arps, a Note on a Case of Double Space Inversion. Annals of Ophthalmology, July, 1914, Vol. XXIII, p. 482. [2] Psychological Review, Vol. IV, pp. 341-360 and 463-481. It is in the phenomenon of ambiguity in the interpretation of the retinal eye processes that this case finds its value. At the dinner table the child complained of the decrease in size of a number of objects in the room, especially was this true of the apparent size of the father's head. The frequency of the complaint led the father to seek the advice of an occulist who pronounced the child's vision perfect in every way. Over and over again while seated at the dinner table the child would exclaim, "O father how small your head is!"