Colour vision : being the Tyndall lectures delivered in 1894 at the Royal Institute (1895)
Abney William de Wiveleslie Sir, 1843-1920, Royal College of Physicians of Edinburgh · London : Sampson Low, Marston · leaf 109
Absorption by the Yellow Spot. 91 the part of the retina, on wliich the axis of the eye falls, as is the case in ordinary vision, and then be observed Fig. 21.
Color Perception
Internet Archive · Royal College of Physicians in Edinburgh · Public domain (published before 1931). Free to use for anything.
