It is more practical in business to use standard size envelopes. If window envelopes are used the window should be clear, the paper white or nearly so, and the typewritten address a good honest black. The enclosure should fit snugly and should be placed so that the address is in plain view without having to be jiggled around in the envelope first. A letter passes through the hands of several postal clerks before it reaches the person to whom it is addressed, and if each one of them has to stop to play with it awhile an appreciable amount of time is lost, not to mention the strain it puts on their respective tempers. The paper of which an envelope is made should always be opaque enough to conceal the contents of the letter.

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