This is a straight optical scan of the version available for free on Google Books. While optical scans of old books are tricky, it's obvious that no care was taken to proof this book before it was printed. Some occasional spelling mistakes are forgivable; whole sections out of order, huge blocks of white space, and paragraphs broken up into multiple pages are not - especially when you're charging over $30. There is a disclaimer about the scan quality in the book itself, but it would have been nice to see that on Amazon as well so an informed purchase could be made.
On the whole, you're better off downloading the book free from Google Books (it's public domain), and printing off a copy for yourself. Let the buyer beware!