Drafts and fair copies of an unfinished philosophical work; see E. G. W. Bill, University reform (1973), p. 240. The principal sections of the work concern the nature and classification of ideas, language, memory and judgement. It is partly in Vaughan's hand and partly in that of his amanuensis George Rigby. 251, 269, 284, 279, 226, 312, 248, 286, 185 leaves