+-----------------------------------------------------------------+ | | | F000.3 | | Zoology | | | | Parker (T.J.) and W.A. Haswell. Text-book | | of zoology. 1903. | | | | Hertwig (R.) General principles of | | zoology. 1906. | | | | Claus (C.) Elementary text-book of | | zoology. 1899. | | | | Nicholson (H.A.) Manual of zoology. 1876. | | | | _OVER_ | | | +-----------------------------------------------------------------+ FIG. 112.--Sheaf Catalogue Subject Slip (Section 288). The classified sheaves can be kept in the same manner, or, if it is felt that a separate slip should be written for each book, to ensure strict order, this of course can be done. But it is at best doubtful if this is necessary save in very large subjects. For example, entries like the above are quite easily discovered (Fig. 112). Where annotations on a large scale are employed, it is best to make use of a separate slip for each entry. [Illustration: FIG. 113.--Adjustable Placard Catalogue (Section 289).] In all kinds of sheaf catalogues a fair margin should be allowed round the entries, to preserve them against finger-marks. The slips are punched so as to secure absolute uniformity in size and in the position of the holes. The hole being made in an oval form allows the slips to be easily threaded on, or removed from the screw-fitting. The special construction of the holders prevents the slips from sagging or drooping at their free ends, a fault observable in both the Staderini and Sacconi forms. It is usual to “guide” all forms of sheaf or slip catalogues, by boldly writing catchwords on both outer corners of each leaf (see Figs. 109-10, 112), and indicating the contents by means of the xylonite label-holders on the backs. The whole subject of sheaf-cataloguing methodology is explained and illustrated in Stewart’s _The Sheaf Catalogue_.