. Electro-physiology . Fio. 283. Fir;. 284. (with a strong current of rest), there is often no genuine negative variation, merely a more or less considerable decrement of the preliminary positive fore-swing (Fig. 284). The current of rest often begins to sink rapidly from the moment of preparation. It may not merely sink to zero, but be reversed. The photo-electric variations are only thereby affected in so far that the individual phases collectively exhibit the opposite signs, while entry, order, course, and magnitude undergo no alteration. The three variations accordingly present the indices
. Electro-physiology . Fio. 283. Fir;. 284. (with a strong current of rest), there is often no genuine negative variation, merely a more or less considerable decrement of the preliminary positive fore-swing (Fig. 284). The current of rest often begins to sink rapidly from the moment of preparation. It may not merely sink to zero, but be reversed. The photo-electric variations are only thereby affected in so far that the individual phases collectively exhibit the opposite signs, while entry, order, course, and magnitude undergo no alteration. The three variations accordingly present the indices — + instead of the normal + — +. The fact that the three phases of the retinal action current, due to transitory illumination, appear in sensitive preparations even when, as with the electric spark, the impact of light is momentary, shows that the medium negative phase must not be regarded merely as the consequence of pcri/xtnait illumination,
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