The Sedgwick Collection (MSS B46) at the New Haven Colony Historical Society
Box 19 Folder C - photo of George Sedgwick's book.
This photo is one of a group marked "Unidentified Individuals."
It is probably 41414 - George Sedgwick (1806-1877) with his Sedgwick Record Book.
George made a 300 page book about Sedgwick Genealogy.
During the Great Chicago Fire, He took it on a boat onto Lake Michigan.
That has to be the book, so that must be him.