Chemistry. In the article “Comments on the article ‘Persistent confusion of total entropy and chemical system entropy in chemical thermodynamics”’ by John Ross, which appeared in number 25, December 10, 1996, of Proc. Natl. Acad. Sci. USA (93, 14314), reference 5 was omitted due to a printer’s error. The reference is as follows:

 5.  Weber, G. (1955) J. Phys. Chem. 99, 13051.