49. Various directions as to sorting have been given, but the worker will soon find out for himself the most convenient mode. The arrangement should be made in regular sequence. Thus the slips must be sorted into first letters, then into second letters, and so on.
50. When the slips are sorted, it will be necessary to place them in boxes or drawers for safety.
51. If the slips are sent to the printer, they must be numbered; but when there are a large number, it is not necessary to put the full number on each slip. It will be sufficient to number up to one hundred, and then begin again, marking down each additional hundred. The alphabetical order of the slips will check the numbering.
52. When a catalogue is printed, lines of repetition must be used if the author's name or other heading is the same in several entries. This line should not be too long, as it is a mistake to vary its length to denote the length of that which is repeated. [201]
53. The usual form for the library copy of a catalogue is folio. If the catalogue is in manuscript, the left-hand page should in all cases be left vacant for additions, and the entries on the right-hand page should not be too closely written, as it is difficult to tell how many additions may be required before the catalogue is worn out. In the case of a printed catalogue, two pages of print can be pasted on one page, and here the right-hand column should be left blank for additions.
