In October 1857 , he was commissioned to conduct botanical investigations in the Dutch East Indies .
In October 1857 , he was consequently spent the following years performing research in Java , Borneo , Sumatra and the Moluccas .
In October 1857 , he was commissioned to conduct botanical investigations in the Dutch East Indies , and consequently spent the following years performing research in Java , Borneo , Sumatra and the Moluccas .