 Even the distinction between the questions of biology and those of philosophy of biology is not absolutely clear. As noted above, philosophers of biology address three types of questions: general questions about the nature of science, conceptual problems within biology, and traditional philosophical questions that seem open to illumination from the biosciences. When addressing the second sort of question, there is no clear distinction between philosophy of biology and theoretical biology. But while this can lead to the accusation that philosophers of biology have abandoned their calling for ‘science reporting’ it can equally well be said that a book like The Selfish Gene (Dawkins 1976) is primarily a contribution to philosophical discussion of biology. Certainly, the professional skills of the philosopher are as relevant to these internal conceptual puzzles as they are to the other two types of question. All three types of question can be related to the specific findings of the biological sciences only by complex chains of argument.