1From John Adams to Mercy Otis Warren, 14 February 1791 (Adams Papers)
By the last post I received your letter of January 17 th , and was as much surprised at the information that my last letter to you arrived unsealed, as you could be at the receipt of it. It was most certainly no intention of mine that it should have gone unsealed; nor can I account for the fact. My conjecture is that the person, one of my sons who copied into my letterbook, either...