Quotation from: The Notebooks of Leonardo Da Vinci
Written by: Leonardo da Vinci
Classification of trees.
393.
TREES.
Small, lofty, straggling, thick, that is as to foliage, dark, light,
russet, branched at the top; some directed towards the eye, some
downwards; with white stems; this transparent in the air, that not;
some standing close together, some scattered.
The relative thickness of the branches to the trunk (393--396).