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
Ludwik de Laveaux (officer) Ludwik de Laveaux (officer) Ludwik de Laveaux was a Brigadier General of the Polish Army in World War I, World War II and Polish–Soviet War. He was born June 18, 1891 in Frysztakua a relative of the painter, Ludwik de Laveaux. He graduated in 1911 from Krakow University, and then studied architecture at the Technical University of Lwów. In World War I he served in the Polish legions 1 and 4 in the Lvov region. Starting a private soldier he was made an officer April 1, 1916, and in 1917 took command of the "city Defense Command" where they took