Interlinguistics of interlinguistics are, however, not so constructive, but rather descriptive, comparative, historic, sociolinguistic, or concerned with translation by humans or machines. As for Esperanto, which is the most widely used constructed interlanguage, there is a relatively abundant literature about the language itself and its philology (see Esperantology). Only a few of the many constructed languages have been applied practically to any noteworthy extent. The most prosperous were Volapük (1879, Johann Martin Schleyer), Esperanto (1887 Ludwik Lejzer Zamenhof), Latino sine flexione (1903, Giuseppe Peano), Ido (1907, Louis Couturat), Occidental-Interlingue (1922, Edgar de Wahl) and Interlingua (1951, IALA and Alexander Gode), with
1st Uhlans Regiment of Polish Legions "Stanisław Bończa", Stefan Kulesza "Hanka", Stanisław Skotnicki "Grzmot", Ludwik Skrzyński "Kmicic". In February and March 1917, cavalry courses (officers and non-commissioned officers) and multi-sealed courses appeared in the regiment. On August 10, 1917, the commander of the Polish Legions passed the command of the regiment to captain Albert Kordecki of the 2nd Cavalry Regiment Albertowi Kordeckiemu z 2 Pułku Ułanów. 1st Uhlans Regiment of Polish Legions 1st Uhlans Regiment of Polish Legions was a detachment of the Polish Legions during World War I. Uhlans of this unit were called "Beliniaki", which was taken from the surname of their original leader,