 A careful re-reading of these debates over the covering-law model in history suggests that the debate took place largely because of the erroneous assumption of the unity of science and the postulation of the regulative logical similarity of all areas of scientific reasoning to a few clear examples of explanation in a few natural sciences. This approach was a deeply impoverished one, and handicapped from the start in its ability to pose genuinely important questions about the nature of history and historical knowledge. Explanation of human actions and outcomes should not be understood along the lines of an explanation of why radiators burst when the temperature falls below zero degrees centigrade. As Donagan concludes, “It is harmful to overlook the fundamental identity of the social sciences with history, and to mutilate research into human affairs by remodeling the social sciences into deformed likenesses of physics” (1966: 157). The insistence on naturalistic models for social and historical research leads easily to a presumption in favor of the covering-law model of explanation, but this presumption is misleading.