The Symbiotic Planet
I felt that the chapters of this book could best be seen as a collection of separate essays, rather than the development of a single thread, which is what I had expected. Possibly more disconcerting is the fact that Margulis always seems to have to be disagreeing with someone. If this had been a book about how she challenged and overcame the forces of orthodoxy then it would have been worth reading, but unfortunately the disagreements tend to take on the form of background noise, which I felt detracted from the rest of the book. But if you don't mind that style of writing then you'll find many interesting ideas in this book.