title: Planck's Principle.
abstract: Two views about the Darwinian revolution are tested: that nearly all scientists in Great Britain had been converted to a belief in the evolution of species within 10 years after the publication of the Origin of Species, and that younger scientists were converted much more rapidly than older scientists. Both views are shown to be less than accurate.
authors.forename: D L
authors.initials: DL
authors.lastname: Hull
authors.forename: P D
authors.initials: PD
authors.lastname: Tessner
authors.forename: A M
authors.initials: AM
authors.lastname: Diamond