ON THE UNDERSTANDING OF SCIENCE. Themata in scientific thought ; Subelectrons, presuppositions, and the Millikan-Ehrenhaft dispute ; Dionysians, Appollonians, and the scientific imagination ; Analysis and synthesis as methodological themata -- STUDIES IN RECENT SCIENCE. Fermi's group and the recapture of Italy's place in physics ; Can science be measured? ; On the psychology of scientists, and their social concerns -- PUBLIC UNDERSTANDING OF SCIENCE. Lewis Mumford on science, technology, and life ; Frank E. Manuel's Isaac Newton ; Ronald Clark and Albert Einstein ; On the educational philosophy of the Project Physics Course.