During the hand-press era, there were usually several different people doing the job of putting a book together; this task was sometimes even completed at different locations.  Printers would try to guard against errors (such as binding the pages in the incorrect order) by printing catchwords at the bottom right-hand corner of each page.  This practice was seen in all editions of the Herball; with each book being so large, it would have been key to avoid errors such as binding the pages out of order.  An example is shown below.  Note how the catchword from the page on “the Stonie wood, or woode made of Stones” correspond to the first words on the next page on “the Goose tree, or Barnacle tree, or the tree bearing Geese.” (see this post for more amazing nomenclature and fantastical plants)

In the case of the 1633 Herball, the pages were in order, but they were mislabeled.  This mislabeling affected the index as well, and the result was that if a reader wanted something on page 31 for example, then they would have to look for the corresponding mislabeled page 31, rather than the “real” page 31.