OF THE HERBARIUM. 
179 
must, first of all, decide whether the preparation is suf- 
ficiently thin and fiat to be laid between the sheets of the 
herbarium, or whether it must be kept’ in a separate 
cabinet, like a specimen of mineralogy. 
A large number, those which have a crustaceous thallus, 
and others which are not attached to their support by their 
whole circumference, may be disposed of in the first 
mentioned way ; care being taken that the stone or wood 
be made as thin as is compatible with the safe keeping of 
the epiphyte : to prevent any undue pressure between 
neighbours, they should be placed by the side of, not 
exactly over, each other. Certain, however, of the gymno- 
carpous section (like Calycium and Coniocybe), which are 
characterised by stalked apothecia, would be spoiled, if 
their safety was not better cared for. These should be 
deposited in chip or pasteboard boxes with covers, or they 
may be fastened on cardboard, with strips of wood, gummed 
on each side, of sufficient thickness to keep the specimen 
from being rubbed : a piece of cardboard laid on the 
wooden strips will still further ensure its integrity ; it may 
then be laid between the pages of a wrapper, as usual.* 
In very large collections coarse solid objects, such as 
stones, which have been encrusted by Lichens, should be 
put away in drawers and boxes, apart from the herbarium. 
At the same time, as their absence necessarily causes a 
gap in the systematic arrangement of the specimens, it is 
well to deposit in the place, which should have been 
occupied by the Lichen, an empty sheet of the wrapping 
paper with a label, which bears on its face the name of 
the missing species, and the number, with which it is 
ticketed in the drawer. 
The same mode of proceeding may be adopted with 
*A11 adhesive materials, as gum, &c., should be first poisoned by 
an infusion of corrosive sublimate ; or a small quantity of some 
essential oil should be mixed with them. This prevents the growth 
of Fungi, and the attacks of insects. — Etf. 
n2 
