With originality and clarity, Harold Brown outlines first the logical empiricist tradition and then the more historical and process-oriented approach he calls the new philosophy of science. Examining the two together, he describes the very transition between them as an example of the kind of change in historical tradition with which the new philosophy of science concerns itself. I would recommend it to every historian of science and to every philosopher of science...I found it clear, readable, accurate, cogent, insightful, perceptive, judicious, and full of original ideas. --Maurice A. Finocchiaro, Isis The best and most original aspect of the book is its overall conception. --Thomas S. Kuhn Harold I. Brown is professor of philosophy at Northern Illinois University.