It’s mentioned on page 14:
Facing Words of Thanks: The beginning of Genesis, in ancient Hebrew (xviii)
As @BeastyGerbil notes, it’s probably a substitution cipher. The Shin (fourth letter on the first line, starting from the right) is recognizable, but the others not so much. Unless it’s a script I’m not familiar with?
It seems to be written in the Samaritan alphabet (note: those letters don't render in Firefox for me, but they do in Safari), which is different from the present Hebrew alphabet I'm familiar with.