Carpenter's principles of human physiology . dlight appears to act as a still more powerful stimulus than white. The adhe-sion of the epithelium to the rods is augmented by a low temperature, whilstit is diminished by the action of curare. The effect of the phototropicstimulation of the retina has been carefully worked out by Kuhne. 573. There are two spots in the Retina in which the arrangement of theforegoing components is essentially different from the rest, and from thesedifferences important physiological conclusions may be drawn. One of theseis the slight eminence at which the Optic nerv
Carpenter's principles of human physiology . dlight appears to act as a still more powerful stimulus than white. The adhe-sion of the epithelium to the rods is augmented by a low temperature, whilstit is diminished by the action of curare. The effect of the phototropicstimulation of the retina has been carefully worked out by Kuhne. 573. There are two spots in the Retina in which the arrangement of theforegoing components is essentially different from the rest, and from thesedifferences important physiological conclusions may be drawn. One of theseis the slight eminence at which the Optic nerve enters, which is a little belowand internal-to the posterior extremity of the axis of the eye. The other isthe yellow spot of Soemmering, which is situated in the exact centre ofthe retina. The modifications undergone by the Retina at the macula lutea * See Boll, Monatsbericht d. Berlin Acad., January and February, 1877; Czerny, der Wien. Acad., Band lvi.; and Kiihne in Hermanns Handbuch der Physiologic,Baud vii. 1879, p. 732 OF THE ORGANS OF THE SENSES, AND THEIR FUNCTIONS.
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