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From Georgian Papers Programme Transcription Wiki
for she has numbered addition in /addition Latin from One to a Hundred, without the least Error, I desire you to praise her before the Queen; & you will do me a Favour, for nothing will be more gratefull.
Farewel
L 18
Serene Lady
It is the Will of the most potent King of Great-Britain, that Princess Mary, with her Sister Louisa, & William the Duke,