The usual heading, termed a center head, is set in the middle of the line. It may be in capitals of the text or in a larger size. If capitals and lower-case are used the size should be several sizes larger, or the face should be bolder. In any case a main heading should be a little more prominent than a line of the text.

A sub-heading is a secondary heading and may be in the center of the measure or a side heading at the beginning of the line. In the latter place it may be in a line by itself, set flush, in italic, in caps. and small caps., or in small bold face; or it may be set in the first line of the paragraph, with the regular indention.

A cut-in head is set in a panel, with or without rule, after the second or third line of the first paragraph.

A running head is at the top of each page of a book or other work of a number of pages. In books and pamphlets the page number is usually at the outside end of the running-head line.

Box headings are enclosed in rules at the top of columns in tabular matter.

In modern practice no punctuation is placed at the end of headings, except the question and quotation marks when these are required. In a heading of two or more lines where a comma or semicolon comes naturally at the end of the first or second line, its omission may change or confuse the sense of the phrase. In such cases it should be used, even if the period is left off the end of the heading.For additional comment on headings and punctuation see other titles of this series: Book Composition (No.20); also Punctuation (No.33) and Capitals (No.34), etc.