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circumstances which I will not mention, as these suffice for my
purpose.
VI.
'Prospettiva de' colri' (Perspective of Colour)
and
'Prospettiva aerea' (Aerial Perspective).
Leonardo distinctly separates these branches of his subject, as may
be seen in the beginning of No. 295. Attempts have been made to
cast doubts on the results which Leonardo arrived at by experiment
on the perspective of colour, but not with justice, as may be seen
from the original text of section 294.
The question as to the composition of the atmosphere, which is
inseparable from a discussion on Aerial Perspective, forms a
separate theory which is treated at considerable length. Indeed the
author enters into it so fully that we cannot escape the conviction
that he must have dwelt with particular pleasure on this part of his
subject, and that he attached great importance to giving it a
character of general applicability.
General rules (289--291).
215
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