Corrections and clarifications.
In the special section "Minorities in science: The pipeline problem" (13 Nov., p. 1175), the graph on page 1199 showing the field distribution of employed scientists and engineers by ethnicity should have been labeled "Percentage" along the x axis. Also, the designation "Engineers" should have read, "Engineers, total." Labeled correctly, the graph would indicate, for example, that among all employed white scientists and engineers in 1988, about 50% were scientists and 50% were engineers. Of employed black scientists and engineers, about 70% were scientists and only about 30% were engineers. Among Hispanics, the breakdown was about 45% scientists and 55% engineers.