A notebook on the Indonesian language that belonged to a Chinese-Indonesian student attending a school in Yogyakarta. Corrections have been made using a red pencil.
Notes on several principles of psychiatry with references to Ernst Kretschmer (1888-1964) and his typology. It also discusses mental disorders, the optical illusions studied by Edgar Rubin (1886-1951) and the socio-cognitive aspects of listening and memorising.