(NB: In this
book the pages are numbered in the recto & verso system. Therefore
only every second page carries the page number. (This system was
typical in early codices, when the codex, or book of bound leaves,
was superseding the continuous scroll.)
In other words,
on each "opening" of the book which you will download,
the recto is on the right side and carries the page number while
the verso is on the left, the reverse of the preceding page, and
is marked not with a page number but a Vo symbol. On page 4, for
example, the Vo opposite, to the left of 4 recto, is 3 verso.