Punctuation and capitalization are very necessary matters in the art of letter-writing, but in these days of common schools, and all but compulsory education, it is to be supposed that some knowledge of these important facts will have been gained. It will not be amiss, however, to mention a few of the most necessary rules.
The four chief punctuation points are the comma, semicolon, colon, period. In the days of our grandmothers children were taught to “mind their stops,” with this rule for a guide: “Count one at a comma, two at a semicolon, three at a colon, and four at a period, or ‘full stop.’”
In punctuating the date, address, closing and superscription of a letter, certain rules are necessary. One of these is that a period follows all abbreviations, such as those of title, state and county, and separates and follows all initials, whether abbreviations of names or titles; while the slight pause occurring between such abbreviations is marked by a comma, and the end of the date, like the end of a sentence, is closed by a period; for example: 540 West Main St., Galesburgh, Ill. Or, Poughkeepsie, N. Y., Jan. 10, 189—.
A colon suggests something more to follow, hence in the salutation of a letter we find a colon at the end, signifying that the body of the letter is yet to come, as: “Dear Sir:” or, where the communication begins on same line of salutation, we find both colon and dash, as: “Dear Madame:—Yours of,” etc.
Commas are used frequently to divide long complex sentences, and the sentence is somewhat further broken by the use of the semicolon between its more decided sections. Abraham Lincoln once said: “I throw in a semicolon whenever I am at a loss what pause to use; it always fits.”
The complimentary close of the letter is followed by a comma and the signature by a period. A period also separates and follows two or more initials, as: Yours truly, (Mrs.) Adeline D. T. Whitney.
Writing the Superscription.
A very long complimentary conclusion should be punctuated like a sentence, as: I am, dear madam, with the most profound esteem, Yours truly, James Talbot.
The superscription on the envelope is to be punctuated according to the above given rules. An interrogation point (?) should be used at the end of all questions. It is in truth, as the small boy said, “A little crooked thing that asks questions.” The exclamation point (!) expressing astonishment, the dash and parenthesis, need only be employed by those thoroughly understanding their use. Quotation marks (“ ”) should always be placed at the beginning and end of words quoted from another; slang, or any fashionable “fad” if written, should be quoted.
As for capitals, one should begin every sentence, all names of persons and places, all appellations of the Deity, the first word of every line of poetry, and show themselves in the pronoun “I,” and the exclamation “O.”