This section is from the book "Two Years' Course In English Composition", by Charles Lane Hanson. Also available from Amazon: Two Years' Course In English Composition.
A letter should be folded with the first page inside.
If the paper is of the ordinary business-letter size, fold it first from the bottom nearly to the top. Then make a fold from right to left a little narrower than the width of the envelope, and finally make a third fold from left to right. The letter is now ready to go into the envelope.
165. Answer for Messrs. T. Y. Crowell & Co., the letter from Mr. Barrow (p. 90). Fold your letter.
166. In class, criticize in writing the letter you have written, using these headings: (1) the appearance of the letter, including the kind of paper used and the size; (2) the beginning, including the heading, the address, and the salutation; (3) the body - whether it is a complete answer to the request; (4) the conclusion, including the complimentary close and the signature; (5) the folding.
 
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