Some of those to whom I am indebted I know, and to them I can acknowledge my debt. I am aware of others, notably patients, on whose cooperation I have always to depend, but who must remain anonymous. Dr Elliott Jaques, Mr R. Money-Kyrle and Dr H. Segal have helped by reading and criticizing my manuscript. Just what generosity of time and effort this means for practising psychoanalysts can only be appreciated by another practising analyst.

Finally, as always, there is my debt to my wife without whose support I could not attempt to write at all.