170. In beginning the letter, place the address and date an inch and a half or two inches below the top of the page.
Leave a margin of about a half inch or more on the left side of the page. Indent the beginning of each paragraph about an inch or more beyond the margin.
In using a four-page sheet, write on the pages in their order, 1, 2, 3, 4.
In the correctly written forms of letters under §174 observe the indentation of the lines. The first line of the inside address should be flush with the margin, the second somewhat set in. The salutation should begin flush with the margin. The body of the letter should begin on the line below the salutation, and some distance in from the margin.
The Outside Address
171. Position of Outside Address. Place the address on the envelope so that it balances well. Do not have it too far toward the top, too close to the bottom, nor too far to one side. See addressed envelope under §173. Place the stamp squarely in the upper right-hand corner, not obliquely to the sides of the envelope.
172. Punctuation of Outside Address. Punctuation may be omitted at the end of the lines of the address. If it is used, place a period at the end of the last line, and a comma after each preceding line.
Within the lines punctuate just as you would in the inside address.
If an abbreviation ends the line, always place a period after it, whether the other lines are punctuated or not.
173. Faults in the Outside Address. Avoid the use of abbreviations except those that would be proper in the inside address or in the heading. See §§ 155 and 158.