Logicians commonly speak in a relatively undifferentiated way about pre-Euler diagrams. The thesis of this paper, however, is that there were three periods in the early modern era in which Euler-type diagrams (line diagrams as well as circle diagrams) were expansively used. Expansive periods are characterized by continuity, and regressive periods by discontinuity: While on the one hand an ongoing awareness of the use of Euler-type diagrams occurred within an expansive period, after a subsequent phase of regression…