259. In a supplement, catalogue the _whole_ of a continued set, not
merely the volumes received since the first catalogue.
_Ex._ If v. 1–4 are in the catalogue and v. 5–10 are received later,
enter all 10 v. in the supplement. It takes no more room, and it is
useless to make the reader look in two places to ascertain how much
of the work the library has. But this should not be done when it will
take up much space, as would often be the case with periodicals, owing
to details of change of name, number of volumes missing, etc. Nor
should Contents be repeated; it is enough to refer.
260. When there are many editions of a work under any subject-heading
omit the titles and merely refer to the author-entry.
Much space may thus be saved at little inconvenience to the reader.
_Ex._ «Gaul.» CÆSAR, C. J. Commentarii [B.C. 58–49]. _See_ «Cæsar», C.
J. (pp. 441, 442); here two lines do the work of forty.