Read the book by the man who taught Milton H. Erickson MD. In 1923, Erickson was a second year undergraduate student at the University of Wisconsin where his teacher, Clark L. Hull, was researching hypnosis and behaviourism: their encounter changed Erickson's life forever. This book explains Hull's experimental methods, results and the scientific approach to hypnosis, which, even today, are being integrated into clinical and therapeutic research. Long out of print, this seminal classic, has helped shape the evolution of hypnosis--as the first extensive systematic investigation of hypnosis using quantitative experimental methodology. Certainly today's clinicians and researchers owe much of what they currently do to the work of Clark Hull. He was a pioneer searching for the means to make behaviourism--and a behavioural view of hypnosis--an exact science.