Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci


_For the sake of clearness, however, it has been desirable to
sacrifice--with few exceptions--the original order of the passages
as written, though it was with much reluctance and only after long
hesitation that I resigned myself to this necessity. Nor do I mean
to impugn the logical connection of the author's ideas in his MS.;
but it will be easily understood that the sequence of disconnected
notes, as they occurred to Leonardo and were written down from time
to time, might be hardly satisfactory as a systematic arrangement of
his principles. The reader will find in the Appendix an exact
account of the order of the chapters in the original MS. and from
the data there given can restore them at will. As the materials are
here arranged, the structure of the tree as regards the growth of
the branches comes first_ (394-411) _and then the insertion of the
leaves on the stems_ (412-419). _Then follow the laws of Light and
Shade as applied, first, to the leaves (420-434), and, secondly, to
the whole tree and to groups of trees_ (435-457). _After the remarks
on the Light and Shade in landscapes generally_ (458-464), _we find
special observations on that of views of towns and buildings_
(465-469). _To the theory of Landscape Painting belong also the
passages on the effect of Wind on Trees_ (470-473) _and on the Light
and Shade of Clouds_ (474-477), _since we find in these certain
comparisons with the effect of Light and Shade on Trees_ (e. g.: _in
No._ 476, 4. 5; _and No._ 477, 9. 12). _The chapters given in the
Appendix Nos._ 478 _and_ 481 _have hardly any connection with the
subjects previously treated._

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