> How would a worm eat perpendicular to the pages and go from the first page of volume 1 to the last page of volume 2?

Sorry, what is the question supposed to be? You're positing a contradiction between two facts:

- The worm's path is perpendicular to the pages.

- The worm's path begins at the first page of volume 1, and ends at the final page of volume 2.

What's the contradiction?