Book reviews : Reflections on Nazi science: a review essay The Nazi Doctors: a study in the psychology of evil By ROBERT JAY LIFTON (Basingstoke, Macmillan, 1986). 561 pp. £12.95 Murderous Science: elimination by scientific selection of Jews, Gypsies and others, Germany, 1933-45 By BENNO MÜLLER-HILL, translated by George R. Fraser (Ox ford, Oxford University Press, 1988). 208pp. £15.00 Racial Hygiene: medicine under the Nazis By ROBERT N. PROCTOR (Harvard, Harvard University Press, 1988). 414pp. £25.25