Reference 31 of the original paper1 contains two arithmetical errors and one bibliographical error. The conclusion, however, remains correct. The footnote should read:
The book The Second Law by P. W. Atkins (Scientific American Books, New York, 1984) promotes the idea that entropy is a measure of homogeneity. (This despite the everyday observation of two-phase coexistence.) To buttress this claim, the book presents five illustrations (on pages 72, 74, 75, and 77) of “equilibrium lattice gas configurations.” Each configuration has 100 occupied sites on a 40 × 40 grid. If the occupied sites had been selected at random, then the probability of any site being occupied would be 100/1600, and the probability of any given pair of sites both being occupied would be . The array contains adjacent site pairs, so the mean number of occupied adjacent pairs would be . The actual numbers of occupied adjacent pairs in the five illustrations are 7, 3, 7, 4, and 3. A similar calculation shows that the mean number of empty rows or columns in a randomly occupied array is . The actual numbers for the five illustrations are 5, 5, 4, 4, and 0. I am confident that the sites in these illustrations were occupied not at random, but rather to give the impression of uniformity.