- OS (“old style”) and NS (“new style”). Letters preceding the change of calendar in 1752 are arranged in the sequence in which they were actually written, allowing eleven days’ difference between "new style" letters from the Continent, and “old style” letters from England.
- Missing letters are marked by an asterisk (*).
- Letters printed here for the first time in the Yale Edition are marked by a dagger (†).
- Letters printed in full for the first time are marked by a double dagger (‡).
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