Rule X.—In headings the important words only should be capitalized.
Titles of books, newspapers, plays, and the like, are written with capitals beginning the important words, most commonly nouns, principal verbs, adjectives, and adverbs. The word the is capitalized as part of the title if the title is quoted exactly.
Examples:—A History of the Rebellion.
Examples:—Free Trade and Protection.
Examples:—Put Yourself in his Place.
Examples:—Milton’s Select Poems.
Examples:—The Beginnings of Poetry.
Rule XI.—The pronoun I and the interjection O are capitalized.
Rule XII.—All names of God, all words that may be regarded as titles of the Deity, should begin with capitals.
Rule XIII.—In compound words, as vice-president, ex-president, etc., the prefix (vice) should not be capitalized.