Joel of Far Outliers has posted some excerpts of Mikołaj Gliński’s contribution to a newsletter from Culture.pl, How much Polish is there in Esperanto? ; it begins:The Slavic Esperanto lexicon is generally considered to derive from two Slavic languages, both of which Zamenhof knew very well – Russian and Polish. And it’s actually these two languages that make up the 1% of Slavic in Esperanto vocabulary. The problem is that sometimes identifying the original language is very hard if not simply impossible. …And yet the group of Esperanto words which are usually identified as Polish loan words is significant.