Sandra... There was no date of birth forEunice Derby, daug. of Rufus, however, there was a marriage date of 19 Nov 1845 in Lyman, Maine to a George Pierce of Quincy, MA. Sorry, this doesn't look like your Eunice. I have also checked for her in the"DABY-DORBY-DATA" book but did not find her.Sorry. I'll keep an eye out for her & Sylvanus for you. Good luck....Jerry Derby..