This series consists of information about members of the Sturgis-Tappan Family (primarily photocopied excerpts from various reference books and anthologies); a photograph of Caroline Sturgis Tappan and a published catalog about her Grand Tour of Europe; and correspondence pertaining to the transfer of Tanglewood to the Boston Symphony Orchestra.

This series is the largest in the collection and is organized into three subseries: letters to and from Caroline Sturgis Tappan, letters to and from her daughter, Mary Aspinwall Tappan, and third party correspondence. The correspondence is extensive among family members across three generations. Also included are letters to and from Lydia Maria Child, William Ellery Channing, Ralph Waldo Emerson, Sophia Hawthorne, and William James. (The Emerson correspondence is significant, while that of the others here listed is limited to one or two letters.)

This series contains primarily pencil drawings and watercolor sketches by Caroline Sturgis Tappan, as well as drafts of poems attributed to Tappan and to her sister, Ellen Sturgis Hooper. There is also correspondence pertaining to ownership of plates for Rainbows for Children (1848), a book by Lydia Maria Child.