Pita wood or the light porous wood of the Agave or Century plant when cut into proper strips also makes a very light and satisfactory lining, while good close bog-peat cut into proper thicknesses is not infrequently used in France and Germany. Druce & Co., 68 Baker street, London, W., England, have lately been manufacturing what is known as cork carpet, which seems to be a combination of ground cork and rubber. It comes in various colors and of the proper thickness, and makes a very smooth and desirable lining, holding the pins very firmly. It cost 90 cents per square yard in England, and I have had one cabinet lined with it as an experiment, as there is a probability that the pins may corrode in contact with the rubber. ARRANGEMENT OF INSECTS IN THE CABINET. _Systematic and biologic Collections._--The permanent arrangement of specimens in boxes and drawers will vary somewhat with the nature of the insects. The almost universal custom of collectors, however, is to arrange the insects in vertical columns. In the case of the smaller forms, as Coleoptera, Hymenoptera, Diptera, 21/2 to 3 inches in width is allowed for the columns; and for the larger insects, as Lepidoptera, Orthoptera, for which larger drawers are recommended, a greater width of column is needed and 41/2 to 5 inches will be found necessary. With alcoholic material, a similar arrangement in columns may be followed. In spacing or dividing insect boxes into columns for the arrangement of specimens, I have followed the plan of pinning narrow strips of colored paper in the boxes at regular distances to divide the columns of insects. A fine line made with a medium pencil will answer the same purpose and will not materially disfigure the box. The appearance of the collection will largely depend on the care used in the alignment of the specimens, both vertically and horizontally. It is advisable to have at least four specimens of a species, which, entomologically speaking, constitute a set. The collector, however, should not limit the number of his specimens to four, as it is frequently necessary to have a larger number to represent, firstly, the sexes; secondly, varieties; and thirdly, geographical distribution. In the systematic collection the species should be arranged serially in accordance with the latest catalogue or monograph, and if the collector intends making a complete study of the group, space should be left for the subsequent insertion of species not at present in his possession and also for new species. This will avoid the rearrangement of the entire collection at brief intervals.