The metadata below describe the original scanning. Follow the "All Files: HTTP" link in the "View the book" box to the left to find XML files that contain more metadata about the original images and the derived formats (OCR results, PDF etc.). See also the What is the directory structure for the texts? FAQ for information about file content and naming conventions.
"With genealogical and historical annotations, from original, local, and other sources, illustrative of the histories and genealogies of the seventeenth century, the calendars of state papers, peerages, and baronetages; with engravings of the arms of the principal families."