the psychodynamics of women, were either not supported or contradicted by research. Reviewing the issues again in 1996, they concluded that much experimental data relevant to Freud's work exists, and supports some of his major ideas and theories. Other viewpoints include those of Hans Eysenck, who writes in Decline and Fall of the Freudian Empire (1985) that Freud set back the study of psychology and psychiatry "by something like fifty years or more", and Malcolm Macmillan, who concludes in Freud Evaluated (1991) that "Freud's method is not capable of yielding objective data about mental processes". Morris Eagle states that it has been "demonstrated quite conclusively that because of the epistemologically contaminated status of clinical data derived from the clinical situation, such data have questionable probative value in the testing of psychoanalytic hypotheses". Richard Webster, in Why Freud Was Wrong (1995), described psychoanalysis as perhaps the most complex and successful pseudoscience in history. Crews believes that psychoanalysis has no scientific or therapeutic merit. University of Chicago research associate Kurt Jacobsen takes these critics to task for their own supposedly dogmatic and historically naive views both about psychoanalysis and the nature of science. I.B. Cohen regards Freud's Interpretation of Dreams as a revolutionary work of science, the last such work to be published in book form. In contrast Allan Hobson believes that Freud, by rhetorically discrediting 19th century investigators of dreams such as Alfred Maury and the Marquis de Hervey de Saint-Denis at a time when study of the physiology of the brain was only beginning, interrupted the development of scientific dream theory for half a century. The dream researcher G. William Domhoff has disputed claims of Freudian dream theory being validated. The philosopher Karl Popper, who argued that all proper scientific theories must be potentially falsifiable, claimed that Freud's Psychoanalytic Theories were presented in unfalsifiable form, meaning that no experiment could ever disprove them. The philosopher Adolf Grünbaum argues in The Foundations of Psychoanalysis (1984) that Popper was mistaken and that many of Freud's theories are empirically testable, a position with which others such as Eysenck agree. The philosopher Roger Scruton, writing in Sexual Desire (1986), also rejected Popper's arguments, pointing to the theory of repression as an example of a Freudian theory that does have testable consequences. Scruton nevertheless concluded that psychoanalysis is not genuinely scientific, because it involves an unacceptable dependence on metaphor. The philosopher Donald Levy agrees with