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
Fusional language analytic structure, such as Modern English, Danish and Afrikaans, or agglutinative, such as Persian and Armenian. Other descendants are fusional, including Sanskrit, Ancient Greek, Lithuanian, Latvian, Slavic languages, as well as Latin and the Romance languages and certain Germanic languages. Some languages shift over time from agglutinative to fusional. For example, while most Uralic languages are predominantly agglutinative, Estonian is markedly evolving in the direction of a fusional language. On the other hand, Finnish, its close relative, exhibits fewer fusional traits, thereby keeping closer to the mainstream Uralic type. One feature of many fusional languages is their systems of declensions.