 apiece.The contributors to the "Penny Cyclopædia" were not individually credited with the articles they created, although a list of their names appears in volume 27.The contributors included many notable figures of the period, including the librarian Henry Ellis, the biblical scholar John Kitto, the publisher Charles Knight, the critic George Henry Lewes, the mathematician Augustus De Morgan, the surgeon James Paget, the statistician George Richardson Porter, the sanitary reformer Thomas Southwood Smith, and the art historian Ralph Nicholson Wornum.