The topic was the recpetion of Whitehead's and Russell's 'Principia
Mathematica" (1910-1913) up to the mid 1930s. This was very wide-ranging
and international, and time was available merely for the British reactions,
not only those of Wittgenstein and Ramsey but also followers such as Stebbing
and Woodger and opponents such as Joseph; and in America, where a long
tradition in foundational questions went back to E.H. Moore and Royce and
their students, and led in the 1930s to the emergence of Quine and the
founding of the Association for Symbolic Logic, an initiative led by C.J.
Ducasse (a Royce student).