From "A Preliminary Sketch of the History of the Roger Bacon Cipher
Manuscript" by Wilfrid M. Voynich (Transactions of the College of Physicians
of Philadelphia, pp.421-422, read April 20, 1921) we learn the following:
"When I brought this manuscript to America the margins of the first page
had the appearance of being blank, but an accident to a photostatic
reproduction of this page revealed the fact that an underexposure of the
plate brings out a faded autograph in the lower margin. Chemicals were
applied to the margins and the autograph, Jacobus de Tepenecz, became
visible, with some illegible figures below it." (Plate 2.--Voynich., p.421)