Corrections and Clarifications
In his letter "Exclusive academies" (28 Aug. 1992, p. 1188), Cesare Emiliani incorrectly stated that 44 (25%) out of 178 living American scientists included in the Concise Dictionary of Scientists (Cambridge Univ. Press, Cambridge, 1989) and in Asimov's Biographical Encyclopedia of Science and Technology (Doubleday, New York, 1992) are not members of the National Academy of Sciences. The correct numbers are 25 (20%) out of 127.