[1] Pleyte began to focus on the study of geography and ethnology as an unpaid volunteer at the Rijks Ethnographic Museum, where he started a new layout of the rooms.
He attended lectures by Professors Hoffmann, Schlegel, Van der Pant, and George Alexander Wilken.
Besides a guide for the collection, Pleyte wrote during his Amsterdam period a large number of articles in scientific journals.
For this, he traveled to the Dutch East Indies, Sumatra, and Bali gathering artifacts, a trip which left a great impression upon him and inspired him to write a number of publications on Indonesian antiquities.
In addition, he worked as a curator at the Royal Batavian Society of Arts and Sciences (now the National Museum of Indonesia in Jakarta), where he carried out many changes.