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 missible, or under other extraordinary circumstances.

In the friendly letter the person written to may be addressed, should be addressed in fact, as he would be spoken to in ordinary conversation when the correspondents are face to face. "Dear Bill," "Dear Doctor Brown," "My darling child," will go in a friendly letter if these are the terms ordinarily employed, and the signature may follow equally familiar lines. It is quite permissible to use a nickname; I still continue to address an old classmate, who occupies a most important and dignified position in real life, as "Face"—a name attached to him in college because nature had given him a very plain physiognomy. I am myself generally known by my initials or as "Tommy." It is well to keep in mind, however, that conservatism is always wisest in letter-writing.

It is safest never to write in a letter anything that would embarrass either correspondent or cause difficulty or regret if the letter should fall into other hands than those for which it was intended. Written secrets are dangerous. If it is necessary for you to say to your friend, "Burn this letter