In 1918, Krohn published "Kalevalankysymyksia" (Kalevala Questions), a two-volume handbook designed for students of Finnish Folk poetry. In "Kalevala Questions" Krohn completely reworked his position on the historicity of the "Kalevala". Krohn had previously argued that the "Kalevala" evolved from small "poetic germ cells" that merged to form a heroic epic. In "Kalevala Questions" he instead took the position that the poems were born as complete works, and had fragmented over time. Krohn argued that the poems were composed at the same time as the Scandinavian Viking Age, and were accounts of real historical events. This was in stark contrast to his previous view of the "Kalevala" as a work of Medieval origin that borrowed significantly from hagiography. While Krohn attributed his change in opinion to his further analysis of "observed facts," he also admitted the influence of the political climate that had emerged following Russification and the Finnish Declaration of Independence. Writing for the nationalist paper "Uusi Suomi" in defense of his new position, Krohn stated that "The formerly peaceful nation of Finland has become militaristic [...] "Kalevala" scholarship has followed the same road." Eight years later, he reworked the book for a foreign audience, added folktale examples and published it as "Die folkloristiche Arbeitsmethode" (Folklore Methodology), which since that time has served as the standard reference work for the Finnish Method.