. Electro-physiology. Electrophysiology. 474 ELECTRO-PHYSIOLOGY CHAP. for the same stimulus, but they are qualitatively different. In " light" frogs—such, , as have been exposed for hours to the full effect of daylight—the positive fore-swing of the negative variation concomitant with the impact of light is entirely wanting, or appears as a trace only. The same reaction, according to Kiihne and Steiner, is exhibited by the retinae of winter-frogs even when confined for days in darkness in a warm room. If the current of rest in an unbleached " dark " retina is of low
. Electro-physiology. Electrophysiology. 474 ELECTRO-PHYSIOLOGY CHAP. for the same stimulus, but they are qualitatively different. In " light" frogs—such, , as have been exposed for hours to the full effect of daylight—the positive fore-swing of the negative variation concomitant with the impact of light is entirely wanting, or appears as a trace only. The same reaction, according to Kiihne and Steiner, is exhibited by the retinae of winter-frogs even when confined for days in darkness in a warm room. If the current of rest in an unbleached " dark " retina is of low , and the negative variation in illumination only moderately developed, there is usually a reversal of the current at excitation, immediately after the positive fore-swing, which lasts throughout the period of light (Fig. 283). In other cases. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biedermann, W. (Wilhelm), 1852-1929; Welby, Frances A. (Frances Alice). London : Macmillan
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