In 1824 Dajnko wrote a book in German called Lehrbuch der windischen Sprache ("The Textbook of the Slovene Language"). In it, he proposed the adoption of a new alphabet for Slovene, which was to replace the traditional Bohorič alphabet, used since the late 16th century. Dajnko wanted improve the script, because of its problems with writing of sibilants. He used his alphabet in all his books published since 1824. In 1825, Franc Serafin Metelko came up with a similar proposal, complicating the issue. The Dajnko alphabet, which was introduced to schools in 1831, was fiercely opposed by Anton Murko (sl) and Anton Martin Slomšek. After 1834 it gradually came out of use with the adoption of a slightly modified version of Gaj's Latin alphabet as the new Slovene script, and in 1839 it was officially abolished.