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
Mark Zamenhof Later he became state cencurist of the texts in the languages Hebrew and Jidda and those positions were received only by the most reliable personalities. Simultaneously that was breakthrough in the officiant hierarchy. According to Z. Weinstein Mark Zamenhof was a secret adviser . Probably Weinstein erred, because the secret adviser was very high, third rank in the officiant ranks, that matched to the rank of general in the army. Zamenhof probably had the 9th rank "title adviser", that matches to the officer rank in Polish army. Prove that the fact the reminiscences according to that Mark, with pride, carried