COLLECTION AND PRESERVATION. 991 
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 con- 
fined 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 minute species is an absolute 
necessity to ensure accurate identification. Little special remark 
is called for here, since the methods adopted for other objects 
will be available. Specimens which have become dry may be 
placed in'water previous to examination, a process which will be 
found essential in such genera as Peziza, Spheria, etc. For 
moulds, which must be examined as opaque objects, if all their 
beauties and peculiarities are to be made out, a half-inch 
objective is recommended, with the nozzle bevelled as much 
to a point as possible, so that no light be obstructed.* 
In examining the sporidia of minute Pezize and some others, 
the aid of some reagent will be found necessary. When the 
* Bubbles of air are often very tiresome in the examination of moulds. A 
little alcohol will remove them, 
