Robin Catalogue:
A. MS., n.p., [c.1905-06], pp. 1-41, unfinished or incomplete, with pp. 18-19 missing and with fragments (possibly from another draft).
The entire manuscript, with the exception of some clearly marked pages concerned with Wundt on the versos, deals with the classification of the sciences. CSP sets out to clarify his Monist article of April 1905 (G-1905-1a).