It is refreshing and encouraging to observe in one person the rare combination of skills and interests which the field of analysis needs at this stage in its development. Dr. Klein is an experimental psychologist who nonetheless has an abiding interest (and one feel's sure, talent) in clinical phenomena and who understands not only analytic theory but analysis as a therapeutic art. Although his 'credo' is addressed to fellow psychologists it could stand quite as well for analysts who are also interested in experimental matters. The real attitude expressed here—'the naturalist's love of phenomena and of their investigation'—is pretty close to the true analytic attitude.