 About Cartwright’s gravitational example, they think (473, fn. 14) that a plausible understanding of the gravitational principle is as describing only the gravitational force between the two massive bodies. (Cartwright argues that there is no such component force and so thinks such an interpretation would be false. Earman and Roberts disagree.) About Lange’s example, they think the law should be understood as having the single proviso that there be no external stresses on the metal bar (461). In any case, much more would need to be said to establish that all the apparently strict and explanatory generalizations that have been or will be stated by physicists have turned or will turn out to be false. (Earman, et al., 2003 includes more recent papers by both Cartwright and Lange, and also many other papers on ceteris-paribus laws.)