Principles of Ophthalmology.

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• Deviations from the Two-Quanta Explanation for Threshold-Values When the Flash-Time and the Visual-Angle of the Test Spot are Large

  1. Our Confirmation of the Two-Quanta Theory When t < τ and d < D

  2. Discussion of the Deviations

• The Two-Quanta Hypothesis as a General Explanation for the Behaviour of Threshold-Values for the Several Receptors of the Human Eye

  1. The Experimental Arrangement

  2. The Peripheral Threshold-Measurements

  3. The Central-Foveal Threshold-Measurements

  4. The Mutual Dependence of the Receptors of Different Kinds in the Retina

• Some Properties of the Nervous System of the Visual Sense

  1. The Nerve-Elements

  2. Some Properties of the Transmission in the Nervous System

• The Sensitivity Dependence on Wave-Length for Foveal and Peripheral Vision and the Fundamental Response Curves

  1. Introduction

  2. The Peripheral Sensitivity Measurements

  3. The Foveal Sensitivity Measurements

• The Quanta-Explanation and the Brightness-Impression

  1. The Experiments

  2. Discussion

• Dependence on