The bud-rings are very plain and easily counted. For this reason, and
because it branches freely, it is a good tree for measurements of growth,
as is seen in the following tables. Nos. 1, 2, 3 and 4: were made by a
class of girls, from fourteen to sixteen, from a tree on my lawn. No. 5
was made by a pupil, whom I taught by correspondence, from a tree of the
same species in another town. No. 6 was made by myself from my own tree.
The measurements of the first four tables were somewhat revised by me, as
they were not perfectly accurate. The pupils should always be cautioned
to measure from the beginning of one set of rings to the beginning of the
next.[1]

[Footnote 1: Care must be taken to select branches well exposed to the
light. Of course there are many circumstances that may aid or hinder the
growth of any particular branch.]

NO. 1.

YEARS. GROWTH OF 1ST BRANCH. 2nd BRANCH. 3RD BRANCH 4TH BRANCH.
MAIN AXIS.
----------------------------------------------------------------
in.
'79 8-1/2 -- -- -- --
'80 4-1/2 2 1-7/8 -- --
'81 3-1/2 1-1/8 2-5/8 -- --
'82 6 5/8 4-1/4 5-7/8 --
'83 7-3/8 3-3/8 5-1/4 4 5-3/4
'84 2 1/2 3/4 3/8 5-3/8
'85 5/8 1/4 3/8 1/2 1
'86 5-5/8 7/8 4-3/8 3-1/8 5