However, it was not until 1644 that the second volume was finally published. Around 1630, he compiled the first book of grammar of the Lithuanian language (Lietuvių kalbos raktas – 'Key to the Lithuanian Language'), which did not, however, survive to our times.
The author compiled a Lithuanian grammar (Lietuvių kalbos raktas – 'Key to the Lithuanian Language') in 1630, but this initial work is no longer extant. The second volume was published in 1644.