"In fact, his "main quarrel with the book" is that "it is presented almost wholly as a ballet of dupes and charlatans;" he considers the authors "a little too unyielding in their criteria for distinguishing between scientists and charlatans," adding "I have the feeling that the de Camps, rationalists themselves, simply could not generate the same kind of understanding interest in this behavior that they showed in their examination of ancient ruins (archeological and archaeologists), or that Sprague brought to his classic study of lost continents.