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 publication of the second volume in 1644 followed by the compilation of a Lithuanian grammar (Lietuvių kalbos raktas – 'Key to the Lithuanian Language') around 1630. This first grammar did not survive to our times.