Having written an excellent letter, and faultlessly addressed the
envelope, all may be easily stamped as unbusiness-like, and spoiled,
by improperly performing so simple a part as the folding. Remember
that excellent rule that, whatever is worth doing should be well done.
With the letter sheet lying before you, turn the bottom edge up
so that it lies along with the top edge, thus making a fold in the
middle, which press down with the thumb nail or with a paper folder.
Then fold the right edge over so that it falls two-thirds the distance
across the sheet, and press down the edge. Next fold the left edge of
the sheet over to the right, breaking the fold at the edge of the part
folded over just before.
In case a check, note, draft, bill or currency is to be sent by
letter, it should be placed on the upper half of the sheet as it lies
open, and then the letter should be folded the same as if it were not
there. This will fold the paper or document in the letter so that it
will be difficult to extract it while being transmitted in the mails,
and so that it will not be dropped or lost in opening the letter.
The letter is now folded so that it will be of equal thickness in
every part of the envelope. Insert the last broken or folded edge in
the envelope first, with original edges of the sheet at the end of
the envelope which the stamp is on; when taken from the envelope the
letter will then be proper side up.