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 Krzywicki Ludwik Krzywicki Ludwik Krzywicki (21 August 1859 – 10 June 1941) was a Polish anthropologist, economist and sociologist. One of the early champions of sociology in Poland, he approached historical materialism from a sociological viewpoint. From 1919 to 1936 he was a professor at the University of Warsaw. Ludwik Krzywicki was born at Płock in 1859 into an aristocratic but impoverished family. From an early age he showed an interest in psychology, philosophy and natural sciences, and studied the works of Darwin, Taine, Ribot and Comte. Krzywicki studied mathematics at the University of Warsaw in Congress Poland. After obtaining his