Middle Ideas 01-06

Contains paras on Old Categories I through VI. PB himself labeled these as "Middle Ideas;" we believe this means they were written in the 1950s and 60s. In general this whole series of notebooks is worthy of study, because it is complete, and from the late 1960s ranging into the last years of PB’s life. He reviewed this entire series with Timothy Smith in 1980, and amended paras to reflect his changed views.