The article is devoted to the letter by the famous in the 1910–1920s American poet Vachel Lindsay, sent to the publishing house Boni and Liveright in 1928, soon after the publication of the memoirs by the American dancer Isadora Duncan. In this letter, the poet in a polemical form defends the dancer from the public reproof, as well as her book, which he evaluates as a high-quality literary production.