Bion, W. R. 1965.  Heinemann. Reprinted by Karnac, 1991.

Extending the original work of his two earlier volumes Learning from Experience and Elements of Psychoanalysis, Bion here focuses on the different types of transformation analyst and patient make of their observations and experiences during a psychoanalysis. He distinguishes three types of transformation: rigid motion transformations, projective transformations and transformations in hallucinosis.