This journal, which he kept during his time as a chief representative of the Dutch East India Company in Japan from 1804 to 1817, provides invaluable insights into Japanese society and culture during the Edo period. It covers a wide range of topics, including:
* Daily life in Japan: Doeff describes his experiences with Japanese customs, traditions, food, clothing, and architecture.
* Political and economic conditions: He records observations on the Japanese government, trade, and economic activities.
* Foreign relations: The journal documents the Dutch presence in Japan, including interactions with Japanese officials and other foreign traders.
* Social customs and beliefs: Doeff sheds light on various aspects of Japanese society, including religion, education, and social hierarchies.
While the journal is his most famous work, he also authored other writings, including:
* "A Narrative of the Life and Adventures of Henry Doeff," a personal memoir published in 1830.
* "Journal of the Voyage of the Dutch East India Company's Ship "The Mercury" from Batavia to Japan," which details his journey to Japan in 1804.
Doeff's writings are considered essential primary sources for understanding Japan during the Edo period. They offer a unique perspective from a foreign observer who spent a significant amount of time in the country and had direct contact with Japanese people from various walks of life.