the first deals with the reasons of the (apparent) diminution of objects as they recede from the eye, and is known as Diminishing Perspective.—The second contains the way in which colours vary as they recede from the eye. The third and last is concerned with the explanation of how the objects [in a picture] ought to be less finished in proportion as they are remote (and the names are as follows):
Linear Perspective. The Perspective of Colour. The Perspective of
Disappearance.
[Footnote: 13. From the character of the handwriting I infer that this passage was written before the year 1490.].
15.
ON PAINTING AND PERSPECTIVE.
The divisions of Perspective are 3, as used in drawing; of these, the first includes the diminution in size of opaque objects; the second treats of the diminution and loss of outline in such opaque objects; the third, of the diminution and