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The College mulberry tree
is rather weak at the
base, though its branches
are vigorous.
June9.
The horizontal beam
which spans the stairs of
F Staircase, New Court,
and carries the wooden
stairs to the attic, is
rotten at one end
where it emerges from
the wall. The only ex-
ternal sign was a
slight settling of the
beam due to compression
of the rotten underside,
and a longitudinal
crack underneath resul-
ting from unevenness of

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compression. About a
quarter of the section
of the beam, on the under-
side, is attacked. The rot
is pale brown and pow-
dery. Probably Poria Vaillantii.
June 10.
Armillaria has recently
been discovered in the area
between the glass-houses,
Main Walk, Broad Walk, and
rock garden at the Botanic
Gardens. An area of
about 60 yards diam. is
affected.