Treatise index: fog, cast shadows, and linear perspective
Chapter list — bodies and buildings in fog, blue evening shadows, smoke and dust, precepts
This index leaf of the Codex Urbinas, headed 'Terza', lists chapter titles with page cross-references ('a car.'); several entries are bare 'precepts' or left without a title in the list. The headings treat which parts of receding bodies lose recognition first, linear perspective, and bodies, buildings, and cities seen in the fog at evening or morning. Others concern why higher distant things are darker in uniform fog, the patches of shadow appearing on distant bodies, why evening shadows on white walls are blue, and where smoke, dust, and smoke are brightest. The leaf carries no drawing, only Melzi's scribal list of headings.
On this page
Blue shadows and shadow-patches at a distance
Headings ask why higher things placed in the distances are darker than low ones though the fog is uniform, treat the patches of shadow that appear on distant bodies, and explain why, toward evening, the shadows of bodies cast on white walls appear blue.
Linear perspective and the relief of remote figures
One heading is devoted to linear perspective, and a later one to the relief of figures remote from the eye. Intervening precepts of painting and headings on the boundaries of white things are noted, some left blank in the list.
Cities and buildings seen in the fog
A run of headings treats bodies seen in the fog, the heights of buildings seen in fogs, and cities or other buildings seen at evening or morning in the fog.