In 1831, Lang established a family emigration scheme. He urged Brisbane Town to establish a Constitution, with convicts not welcome. He recruited Ministers from Europe for what is now Queensland. In 1833 & 1836, he was in Britain and appealed to the Church in Germany for Missionaries to seek the conversion of native Black Australians — the so-called 'Aboriginees' of Moreton Bay near Brisbane. The Mission was planted at Zion's Hill, near Nundah.
Indeed, it soon came to pass that the penal settlement near Brisbane was closed down and the last convicts evacuated. The area was opened up to free immigrants, from 1842
