Notes in BR's hand on various speakers (Moore, Schiller, Mackenzie, Whitehead, Broad, Karin Stephen, Carr, Stebbing, and two unnamed speakers) were bound between the table of contents and p. 1 of Problems of Science and Philosophy (Russell's Library, no. 2309). The notes are on the back of 70, Overstead Mansions (LOV), stationery. The notes are presumably on the audience's responses following BR's delivery of "On Propositions".
 

The notes remain in the book.