me. Nearly all libraries now are arranged
according to one general plan, so a visitor who knows this scheme can
easily find the class of books he wants in almost any library he uses.
This arrangement is based upon the following decimal numbering and
grouping of subject matter.

LIBRARY CLASSIFICATION

000 to 090, _General works_. Bibliography. Library economy.
Cyclopedias. Collections. Periodicals. Societies, museums. Journalism,
newspapers. Special libraries, polygraphy. Book rarities.

100 to 190, _Philosophy_. Metaphysics. Special topics. Mind and body.
Philosophic systems. Mental faculties, psychology. Logic, dialectics.
Ethics. Ancient philosophers. Modern.

200 to 290, _Religion_. Natural Theology. Bible. Doctrinal dogmatics,
theology. Devotional, practical. Homiletic, pastoral, parochial.
Church, institutions, work. Religious history. Christian churches and
sects. Ethnic, non-christian.

300 to 390, _Sociology_. Statistics. Political science. Political
economy. Law. Administration. Associations, institutions. Education.
Commerce, communication. Customs, costumes, folklore.

400 to 490, _Philology_. Comparative. English. German. French.
Italian. Spanish. Latin. Greek. Minor literatures.

500 to 590, _Natural science_. Mathematics, Astronomy. Physics.
Chemistry. Geology. Paleontology. Biology. Botany. Zooelogy.

600 to 690, _Useful arts_. Medicine. Engineering. Agriculture.
Domestic economy. Communication, commerce. Chemic technology.
Manufactures. Mechanic trades. Building.

700 to 790, _Fine arts_. Landscape gardening. Architecture. Sculpture.
Drawing, decoration, design. Painting. Engraving. Photography. Music.
Amusements.

800 to 890, _Literature_ (same order as under _Philology_, 400).

900 to 990, _History_. Geography and travels. Biography. Ancient
history. Modern Europe. Asia. Africa. North America. South America.
Oceanica and polar regions.

M. DEWEY: _Decimal Classification_

Using Periodicals. In the section on taking notes the direction was
given that in citing legal decisions the latest should be secured.
Why? That same principle applies to citing any kind of information in
a speech. Science, history, politics, government, international
questions, change so rapidly in these times that the fact of yesterday
is the fiction of today, and _vice versa._ A speaker must be up to
date in his knowledge. This he can be only by consulting current
periodicals. He cannot read them all so he must