910. Never write below the last line upon a ruled sheet. In typewritten manuscript leave at least half an inch at the bottom of the page.
Underscoring
911. Underscore a word once for italics, twice for small capital letters, and three times for large capital letters.
912. Never underscore a word for emphasis.
Footnotes
913. Use superior figures for footnotes, placing the figure after the expression referred to.
914. Place footnotes at the bottom of the page preceded by the superior figure corresponding to that used in the text.
Abbreviations
915. Use no abbreviations in formal composition except Mr., Mrs., or Dr.