 Dorothy Wrinch, who had been a member of Russell’s circle of unofficial students during the war, published in 1919 an article on Dedekindian series of ordinal numbers. She describes the result as investigating “necessary and sufficient conditions that \(P^Q\) should be Dedekindian or semi-Dedekindian when P and Q are well ordered series” (Wrinch 1919: 219). This study follows up the result in ∗124 that is described in Boolos (1994), as an investigation of the arithmetic of ordinals without assuming the Axiom of Choice. Wrinch’s paper  follows not only the notation of PM, but also makes use of theorems up to the end of section V on Series, with numbers following the dot, and so could easily be added as ∗277. Russell intended to found a school of “mathematical philosophy”, and of course succeeded in attracting Ludwig Wittgenstein to the foundational issues in PM, but there is no other indication of logicians attempting to set their results in the framework of PM.