Guide to the identification of marine plants and invertebrate animals ...

_to_
pressed from the specimens, the newspapers may be teft
out after the fi-rst change of the press. Use of news-
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of sal-t crystals
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in the bl-otters.
Care of Finished SDecimens. No attemDt shoul-d be
. :----:.-- :=made
to lift the waxed paper off the specimens untilthev
ale thoror'^L'r.' ^-.' n* Lrrey q! s Lrrv! vuYrrJy vL y . nL this time it will_ often
fal-i- off. If not, it is best to peel the waxed paper
off from the base of the plant upward. If the plant
begins to lift from the mounti-ng paper when the waxed
paper is pulled upward, hold the plant down next to the
waxed paper and pull- gently until the waxed paper comes
off without l-ifting the specimen. The majority of specimens
wi-li- stick to the mounting paper adequately by
virtue of their own polysaccharide cell- wal-l- constituents,
which act as adhesives. A few species, such as Sargassum
and Fucus, will have to be fastened down later, however.
Gummed cloth tape is best, but mucilage of some sort can
be used. Non-water-sol-uble adhesives are not recommended
for specimens that have taxonomj-c va1ue, as this prevents
the removal of a portion of the specimen l-ater for
soaking preparatory to microscopic study. When soaked
in water, especiatty with a l-ittl-e detergent added, most
pressed algae will- swel-l- to the original, normal condition
and can then be studied in detail.
Finished specimens shoul-d be kept under mild pressure
of some sort (such as a book) at least until- they come into
moisture equilibrium with the atrnosphere, and shoul-d always
be kept in the dark when not under observation, unless
they are to be framed f or wal-l- hanging.