[2] As a young man he was sent on expeditions to Africa and Mauritius by Franz Sieber.

He was accompanied by Malagasy Prince Rafaria who studied on Mauritius and James Hastie, a Scottish corporal and British envoy for King Radama I on Madagascar.

Bojer explored the west coast of Madagascar before he arrived in Tananarive.

He explored several coasts of the African continent and collected a huge amount of minerals and plants.

In 1829 he was one of the co-founders of the Royal Society of Arts and Sciences (SRAS) at Mauritius.