 Regarding, on the other hand, Theophrastus’ influence on Stoicism, at least in its earliest years, it has been argued that it was probably minimal in all three parts of Stoic philosophy: Stoic ethics presented happiness as entirely independent of external circumstances or chance events, while the Stoics’ account of physical phenomena was mainly influenced by Heraclitus and Plato’s Timaeus. In logic, finally, it may be true that Theophrastus elaborated a logic of propositions, but there is no doubt that he considered the categorical syllogism as primary, and never came close to developing Chrysippus’ sophisticated hypothetical syllogistic. Therefore, it is not the case that the early Stoics put forward positions that they could scarcely have adopted without the help of Theophrastus’ doctrines or methods, even if it proves that he left a stronger imprint on Chrysippus than on Chrysippus’ Stoic predecessors (see Barnes 1985; Long 1998).