The third rule can be expressed as follows: RULE 3. SET FORTH THE MAJOR PARTS OF THE BOOK, AND SHOW HOW THESE ARE ORGANIZED INTO A WHOLE, BY BEING ORDERED TO ONE ANOTHER AND TO THE UNITY OF THE WHOLE.
I believe Adler is making the argument I make is that a textbook is more than the sum of parts because the author has a structure for how the parts fit together.
