In 1824 Bürger left for Batavia (Dutch East Indies), now Jakarta, where he visited the school for apothecaries.
In 1826, both Bürger and Kawahara Keiga joined Siebold on the court journey to the Shogun in Edo.
[1] In 1828 Bürger was appointed as successor of Von Siebold as far as the chemical, natural and biological work was concerned.
In the following years he collected large quantities of minerals, plants, reptiles and animals, among which 650 fishes and crustaceans.
Plants sent by Bürger arrived in the botanical gardens of university cities like Leiden, Groningen, Munich, Paris, London, Florence and St. Louis.
Back on Java he was pensioned off in 1842 as a member of the Natural Committee, and on 30 June 1843 he was honorably discharged from public service.
the production of rice and oil on Bangka, the Nederlandsch-Indische Zee-Assurantie Maatschappij (marine insurances), de Maatschappij tot Bevordering van Mijnontginningen in Nederlandsch-Indië (Society for the advancement of mining development in the Dutch Indies), which operated on Borneo, and he was co-owner of sugar factory Rejosari in Magetan (Madiun Residency, Java).