lling had taken place, are as plump and
natural in our cabinet as they were when collected six or seven years
ago.

Moulds are always troublesome to preserve in a herbarium in a state
sufficiently perfect for reference after a few years. We have found it
an excellent method to provide some thin plates of mica, the thinner
the better, of a uniform size, say two inches square, or even less.
Between two of these plates of mica enclose a fragment of the mould,
taking care not to move one plate over the other after the mould is
placed. Fix the plates by a clip, whilst strips of paper are gummed or
pasted over the edges of the mica plates so as to hold them together.
When dry, the clip may be removed, and the name written on the paper.
These mounts may be put each in a small envelope, and fastened down in
the herbarium. Whenever an examination is required, the object, being
already dry-mounted, may at once be placed under the microscope. In
this manner the mode of attachment of the spores can be seen, but if
mounted in fluid they are at once detached; and if the moulds are only
preserved in boxes, in the course of a short time nearly every spore
will have fallen from its support.

Two or three accessories to a good herbarium may be named. For fleshy
fungi, especially Agarics, faithfully coloured drawings, side by side
with the dried specimens, will compensate for loss or change of colour
which most species undergo in the process of drying. For minute
species, camera lucida drawings of the spores, together with their
measurements, will add greatly to the practical value of a collection.
In mounting specimens, whether on leaves, bark, or wood, it will be of
advantage to have one specimen glued down to the paper so as to be
seen at once, and a duplicate loose in a small envelope beside it, so
that the latter may at any time be removed and examined under the
microscope.

In arranging specimens for the herbarium, a diversity of taste and
opinion exists as to the best size for the herbarium paper. It is
generally admitted that a small size is preferable to the large one
usually employed for phanerogamous plants. Probably the size of
foolscap is the most convenient, each sheet being confined to a single
species. In public herbaria, the advantage of a uniform size for all
plants supersedes all other advantages, but in a private herbarium,
consisting entirely of fungi, the smaller size is better.

The microscopic examination of m