To celebrate the centenary of the birth of Boris Osipovich Dolgikh, the great Russian ethnographer of Siberia, this article gives an account of his first field expedition to the Kets, Evenkis, Nganasans, and Dolgans of central Siberia. The author, himself a former student of Dolgikh, argues that Dolgikh's work as an enumerator for the 1926/27 census forged his identity as an ethnographer. He also implies that the expedition for the 1926/27 census was a cradle for the careers of many other scientists. The article is framed by a history of Soviet science by the editor. It also serves as an introduction to the unique polar census expedition, which the editor argues is better understood as ‘an inscription’ of Siberian aboriginal peoples than as a statistical census in the traditional sense.