Main works: "Memory" 1885, "Principles of Psychology" [the first half of the first volume (1897), the second half and the whole volume (1902), the first half of the second volume and The simplified version of the book (1908), the complete book was later completed by Durr and Bühler. This book became very popular after its publication and became a rage]. "Outline of Psychology" (1908), the first sentence of the book is: "Psychology has a long past, but only a short history." This sentence has become a frequently quoted famous saying in psychology.