SECTION I. Symmetrical Flicker. A. Method employed. The rotating ' binocular' Lantern. B. Observations. Absence of evidence of summation OT interfereme of flicker reactiOns,aimilar in degree and rate but varying from synchronism to d$erent degrees of aaynchronimn, generated at ' coweapnding ' points. Evidence of interference of aaymnzetrical flicker reactions generated at ' correapmding' points. Uniocular and Binocular Comparisons. Talbot's law not applicable to ' wrreaponding ' points. Rule of

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... g ' points. Rule of relation of biwular bnghtneas to component uniwclar bnghtneasea. Fechner's paradox. Prevalena of contows un& Weber's law and under binocular summation compared. SECTION 11. Asymmetrical Flicker. SECTION 111. SECTION IV. General Conclusions. The physiological initial stages of the reaction generated in either component of a pair of ' cmaponding retinal points' proceed without touching any of the apparatus of the twin point. Only ayter sensations initiated ?om the right and Zej 2 'points' have been elaborated, and have reached a dignity and de@itms renaking them well amenable to introspection, does interfweme between the reactions of the two (left and n'ght) eye-system OcCuT. Xince lej2 and right end-reaults emerge pure, hyhridisatimi cannot have mixed the early stages in their evolution. The binocular sensation attained seems contbined jkm right and left unwcdar seneations elaborated in&-iDendently. THE following experiments attempt inquiry into the influence exerted on the reactions of a 'retinal point' by certain forms of activity at the 'corresponding point' of the other retina. 1 The experiments were the subject of a brief communication to the Royal Soaiiety's