RT Journal Article SR Electronic T1 NATIONAL ACADEMY OF SCIENCES: Abstracts of Papers Presented at the Autumn Meeting, November 9-11, 1953Massachusetts Institute of Technology, Cambridge, Massachusetts JF Science JO Science FD American Association for the Advancement of Science SP 756 OP 756 DO 10.1126/science.118.3077.756-a VO 118 IS 3077 A1 EPSTEIN, SAMUEL YR 1953 UL http://science.sciencemag.org/content/118/3077/756.2.abstract AB In the abstract of the paper, "The Direct Observation of Hapten-Antibody Equilibria" presented before the National Academy of Sciences, which was published in the Nov. 13th issue of SCIENCE, p. 570, there isan error due to a miscalculation. A value of 5.5 kcal isgiven for the free energy of formation (per mole) of ahapten-antibody bond. This value should be 7.6 kcal.