  Although Ontology is perhaps the most generally interesting of Leśniewski’s systems, it was known during his lifetime less through his own published work, which was confined to a short, technical and inaccessible memoir, but through a gentle and sympathetic exposition in Kotarbiński’s 1929 widely read and influential Warsaw textbook known simply as the Elementy. Kotarbiński explains how he had no need to come up with a logical system of names and predicates, since he could get one ready-made from a firm with an excellent reputation. Leśniewski was duly grateful for the plug.