CHAPTER III.

PHENOMENA OF SIGHT, AND ART PRINCIPLES DEDUCED THEREFROM.

Introduction and Argument 97

Optic Nerves 97

Le Conte’s Classification of the subject 98

Physical characters of the eye as an optical instrument 98

Direction of Light 102

Intensity of Light 103

Colour 108

Psychological data, and binocular vision 111

Perspective, depth, size, and solidity 112

Art principles deduced from the above data 114

BOOK II.

TECHNIQUE AND PRACTICE.