VI. On the retinal currents of the frog's eye, excited by light and excited electrically

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Abstract
It has been shown by several previous observers (Holmgren, Dewar and M'Kendrick, Kühne and Steiner) that the excised eyeball gives an electrical current, which under goes variation sat illumination, and that these variations of current are due solely to changes occurring in the retina. All the observers above named describe the variation to be positive at the commencement and at the end of illumination. Holmgren makes no distinct statement with regard to the state during illumination. Dewar and M'Kendrick seem to imply that the state during illumination is negative. Kühne and Steiner distinctly assert that the state is positive during illumination, and that variations of the type described by Dewar and M‘Kendrick are characteristic of an injured, fatigued, or dying eyeball.

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