upon the principle that a "heading" is not required unless there are two or more books to go under it. By the reverse process, if there should be two or more title-entries of books unquestionably upon the same subject then these are converted into entries under a single subject-heading. If the two entries were
Portugal, In. Bell, A. F. G. 1912
Portugal, Sunshine and storm in. Watson, G. 1904
they are changed to
Portugal:
Bell, A. F. G. In Portugal. 1912
Watson, G. Sunshine and storm in Portugal. 1904
It is possible further to economise these entries:
Portugal:
Bell, A. F. G. In P. 1912
Watson, G. Sunshine, etc. in P. 1904
This style was adopted in quite good catalogues, and there is no particular loss of information through it, though the gain of space hardly compensates for the want of clearness, to say nothing of the somewhat bald appearance of the entries.
In all the subject-entries above it will be observed that the author's surname leads, the reason for this being that it serves to guide to the name under which the main-entry is to be found. The books are also arranged in alphabetical order by these surnames under the subject-heading.
If the catalogue we are compiling is not dictionary but classified in its arrangement, then, as already stated, there is but one entry (other than the brief index entries), and that the main-entry. Upon this is marked the numerical symbols of the classification adopted, which we shall presume throughout is the best-known and most used, Dewey's Decimal Classification. For convenience in sorting, the numbers are better written on the top right-hand of the slip or card. Our entry is marked accordingly