Uralic languages impetus from the fact that these languages, unlike most of the other languages spoken in Europe, are not part of what is now known as the Indo-European family. In 1717, Swedish professor Olof Rudbeck proposed about 100 etymologies connecting Finnish and Hungarian, of which about 40 are still considered valid. Several early reports comparing Finnish or Hungarian with Mordvin, Mari or Khanty were additionally collected by Leibniz and edited by his assistant Johann Georg von Eckhart. In 1730, Philip Johan von Strahlenberg published his book ("The North and East Parts of Europe and Asia"), surveying the geography, peoples and languages
Uralic–Yukaghir languages his 1931 book "Linguistic Science in the Nineteenth Century" (p. 338). Pedersen included both languages in his proposed Nostratic language family (ib.). A genetic relationship between Uralic and Yukaghir was argued for in "Jukagirisch und Uralisch" ('Yukaghir and Uralic'), a 1940 work by Björn Collinder, one of the leading Uralic specialists of the 20th century (Greenberg 2005:124). Collinder was inspired by a 1907 article by Heikki Paasonen, which pointed to similarities between Uralic and Yukaghir, though it did not identify the two languages as genetically related (Greenberg, ib.). Uralic–Yukaghir is listed as a language family in "A Guide to the