With the in-place frog’s eye, the potential difference between the center of the corneal surface and the rest of the cornea reached a maximum of about −15 mv at the corneoscleral junction. This large a corneal potential difference may be the immediate source of the potential presumably utilized in the electro-oculogram, rather than the cornea-to-fundus potential. A slightly injured section of the cornea and also the aqueous humor had a potential of approximately +15 mv with reference to the corneal center. These two potentials appeared to be separated by an insulating layer, presumably the interface between the corneal epithelium and Bowman’s membrane. The potential difference between the corneal center and the front interior part of the lens was about −33 mv, and about −47 mv for the back. The vitreous side of the retina was about −2 mv. Within the retina, transient steps of about −50 mv occurred. These were not the same shape or in the same order from frog to frog, or from one place in the same retina to another, except for one. This was a step of −40 to −60 mv which was presumably Brindley’s R membrane.
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