Memoirs v. Massachusetts, 383 U.S. 413 (1966), properly A Book Named "John Cleland's Memoirs of a Woman of Pleasure" et al. v. Attorney General of Massachusetts, was the United States Supreme Court decision that attempted to clarify a holding made in Roth v. United States, 354 U.S. 476 (1957) a decade earlier regarding obscenity.
Since the Roth ruling, to be declared obscene a work of literature had to be proven by censors to: 1) appeal to prurient interest, 2) be patently offensive, and 3) have no redeeming social value. The book in question in this case was Fanny Hill, and the Court held in Memoirs v. Massachusetts that, while it may fit the first two criteria (it appealed to prurient interest and was patently offensive), it could not be proven that Fanny Hill had no redeeming social value. The judgment favoring the plaintiff continued that it could still be held obscene under certain circumstances -- for instance, if it were marketed solely for its prurient appeal.
Pornographers took this holding to mean that as long as they included some "redeeming social value" (like "medical films" prefaced by passages from Shakespeare). Memoirs v. Massachusetts led to more years of debate about what was and was not obscene and the conferring of more power in these matters to proposers of local community standards.
External links
Full Text of the opinion courtesy of FindLaw (http://caselaw.lp.findlaw.com/scripts/getcase.pl?court=us&vol=383&invol=413)
Studies in the methodology and philosophy of science have shown that many scientific theories, particularly in the historical sciences, are formulated and justified as inferences to the best explanation (Lipton 1991:32-88, Brush 1989:1124-1129, Sober 2000:44).
Cleland, C. Historical science, experimental science, and the scientific method.--Geology 29:987-990.
Instead, such theories are usually tested by comparing their explanatory power against that of their competitors with respect to already known facts.