394.
All the branches of a tree at every stage of its height when put
together are equal in thickness to the trunk [below them].
All the branches of a water [course] at every stage of its course,
if they are of equal rapidity, are equal to the body of the main
stream.
395.
Every year when the boughs of a plant [or tree] have made an end of
maturing their growth, they will have made, when put together, a
thickness equal to that of the main stem; and at every stage of its
ramification you will find the thickness of the said main stem; as:
_i k_, _g h_, _e f_, _c d_, _a b_, will always be equal to each
other; unless the tree is pollard--if so the rule does not hold
good.
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