 that commonly called 'Eulerian circles,' has met with any general acceptance..." Lewis Carroll (Charles Dodgson) includes "Venn's Method of Diagrams" as well as "Euler's Method of Diagrams" in an "Appendix, Addressed to Teachers" of his book "Symbolic Logic" (4th edition published in 1896).The term "Venn diagram" was later used by Clarence Irving Lewis in 1918, in his book "A Survey of Symbolic Logic".Venn diagrams are very similar to Euler diagrams, which were invented by Leonhard Euler in the 18th century.