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 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_, _Sphæria_, 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.[B] In examining the sporidia of minute _Pezizæ_ and some others, the aid of some reagent will be found necessary. When the sporidia are very delicate and hyaline, the septa cannot readily be seen if present; to aid in the examination, a drop of tincture of iodine will be of considerable advantage. In many cases sporidia, which are very indistinct in glycerine, are much more distinct when the fluid is water. The following hints to travellers, as regards the collection of fungi, drawn up some years since by the Rev. M. J. Berkeley, have been widely circulated, and may be usefully inserted here, though at the risk of repetition:--