There remains only the obligation to thank those who have helped me with specific suggestions and the editors who have kindly granted permission to reprint material which first appeared in the pages of their journals. To the former group belong Alan B. Brinkley and Max O. Hocutt Portion of chap­ ters I and VI were published in Philosophy of Science; of chapters IV and V in Perspectives in Biology and Medicine; of chapter VIII in Dialectica; of chapter IX in The British lournal for the Philosophy of Science; and of chapter XIII in Synthese. J.K.F. New Orleans, 1971 PREFACE In this book I have tried to describe the scientific method, understood as the hypothetico-experimental technique of investigation which has been prac­ ticed so successfully in the physical sciences. It is the first volume of a three-volume work on the philosophy of science, each of which, however, is complete and independent. A second volume will contain an account of the domain in which the method operates and a history of empiricism. A third volume will be devoted to the philosophy of science proper: the metaphysics and epistemology presupposed by the method, its logical structure, and the ethical implications of its results.