Published as 4.350-371, with deletions. Deleted: two complicated examples on pp. 5-8, 21-22 and some random comments, concerned chiefly with Eulerian diagrams and the history of logical graphs.
Eulerian Diagram, Graphs logical (see also Diagram Eulerian Graphs), Logic (modal see Modality)
pp. 1-64 plus 30 pp. of several starts