a revision of Volapük which was published in 1931 (now called Volapük Nulik "New Volapük" as opposed to the Volapük Rigik 'Original Volapük' of Schleyer). This revision was accepted by the few speakers of the language. De Jong simplified the grammar, eliminating some rarely used verb forms, and eliminated some gendered pronouns and gendered verb endings. He also rehabilitated the phoneme and used it to make some morphemes more recognizable. For instance, lömib "rain" became rein. Volapük enjoyed a brief renewal of popularity in the Netherlands and Germany under de Jong's leadership, but was suppressed (along with other constructed languages) in countries under Nazi rule and never recovered. Regarding the success of this artificial language, the Spanish scientist Santiago Ramón y Cajal wrote in the first edition of his Tonics of Willingness, in 1898: However, some years later (1920), in the third edition of the same book, he added the following footnote to the former assertion: "As it was presumable, nowadays -1920-, the brand new Volapük has been forgotten definitively. We forecast the same for Esperanto." Large Volapük collections are held by the International Esperanto Museum in Vienna, Austria; the Center for Documentation and Study about the International Language in La Chaux-de-Fonds, Switzerland; and the American Philosophical Society in Philadelphia, Pennsylvania. In 2000 there were an estimated 20 Volapük speakers in the world. In December 2007 it was reported that the Volapük version of Wikipedia had recently jumped to 15th place among language editions, with more than 112,000 articles. A few months earlier there had been only 797 articles. The massive increase in the size of "Vükiped", bringing it ahead of the Esperanto Wikipedia, was due to an enthusiast who had used a computer program to automatically create geographical articles, many on small villages. The motive was to gain visibility for the language. By March 2013 the Esperanto Wikipedia, with a very active user community, had risen to 176,792 articles, while the Volapük Wikipedia had at that point 119,091 articles. There has been a continuous Volapük speaker community since Schleyer's time, with an unbroken succession of Cifals (leaders). These were: Johann Martin Schleyer 1879–1912 Albert Sleumer 1912–1948 Arie de Jong (provisionally) 1947–1948, 1951–1957 Jakob Sprenger 1948–1950 Johann Schmidt 1950–1977 Johann Krüger 1977–1983 Brian Bishop 1984–2014 Hermann Philipps 2014–present Orthography and pronunciation The alphabet is as follows: That is, the vowel letters ä, ö, ü have the pronunciations they do in