This work investigates the linguistic relationship between Hungarian and Fennic languages. Samuel Gyarmathi, a Hungarian physician and linguist, presents his findings based on comparative analysis of vocabulary, grammar, and phonology. The book argues for a shared origin, challenging prevailing views of the time.

This book is recognized as a significant, albeit controversial, contribution to Uralic linguistics. Gyarmathi's rigorous comparative method, even if not fully accepted by all contemporaries, laid crucial groundwork for future research into language families. The work is considered a foundational text for understanding the historical debate surrounding Hungarian's linguistic origins.