 His first scientific paper was "Nogle Raskiana" (1874).He began to study the accent of Danish and Slavic languages, and he was puzzled by the fact that the Gothic words "fadar" and "broþar" have different consonants after the root vowel.He was preoccupied with the study of accent at the time, so he sought the explanation in that direction which led to the formation of Verner's Law.