by the same author are distinguished from one another by adding other
figures to the author-number, or by adding to the author-numbers the
first letter of the title of each book.

These book-marks cannot be chosen arbitrarily. They should be taken
from the printed set of them worked out by Mr Cutter, and called the
Cutter author-tables. (See Library Bureau catalog.)

In a very small library the books in a given class can be
distinguished one from another by writing after the class-number of
each book the number of that book in its class. If the class-mark of
religion, for example, is 20, the books successively placed in that
class will bear the numbers 20.1, 20.2, 20.3, etc.

Fiction should have author-numbers only. The absence of a class-number
will sufficiently distinguish it from other classes.




CHAPTER XXIV

The shelf-list


Many books can be very properly put in any one of several different
classes. In which one a given book should be placed will often be
decided by noting where other like books have been placed. Books by
authors of the same name will often fall into the same class, and to
each of these a different author-number must be given. You must have