12. Separate center heads from text by slugs one size less than type used.
13. When two consecutive years are intended, set: 1875–76, 1801–2; when more than two consecutive years are intended: 1875–1879, 1895–1904; when two or more distinct years are intended: 1894, 1895; 1873, 1876; 1888, 1891, 1894.
14. When laws are set in long-primer type, document measure, the first line of the enacting clause must be set so as to conform to the following examples:
Be it enacted by the Senate and House of Representatives of the United
Resolved by the Senate and House of Representatives of the United States
15. In indexes, when the page folios overrun, retain only the first folio number in the leader line; but when necessary to save an overrun, figures may be run back to within an em leader of the words. When the folios overrunning make two or more lines, indent evenly not less than seven ems on the left, the folios in excess of even-length lines to be worked into the leader line. When the figures extend back into the leader line, use an en quad between the leaders and the first figure.
16. Never divide a word in a headline if it can possibly be avoided. In subhead and legend lines it is not necessary to make the first line full.
17. Always keep together, at the beginning or end of a line, such abbreviations as U. S. N.; D. C.; N. Y.; N. J.; M. D., etc. The contractions esq., sr., and jr. should always be in the same line with the name they follow.
18. Never divide the last word of a paragraph if it can be avoided; overrun if necessary. The last line of a paragraph should contain at least a four-letter word.