Here are some of his major works:
Ethnographic and Linguistic Works:
* "The History of the Tagalog Language" (1889): This was a groundbreaking work on the Tagalog language, its grammar, and its history.
* "The Ethnology of the Filipinos" (1888): This work explored the customs, traditions, and beliefs of different Filipino ethnic groups.
* "The Economic Condition of the Filipinos" (1888): This work examined the economic realities of Filipino society.
* "The Indigenous Religions of the Philippines" (1891): This work focused on the pre-colonial religions of the Philippines.
* "The Social Structure of the Filipinos" (1892): This work examined the social organization and hierarchy of Filipino communities.
Works Related to the Philippines:
* "The Philippines: A Geography, History, and Ethnology" (1893): This work provides a comprehensive overview of the Philippines.
* "The Philippine Revolution: A Personal Perspective" (1900): This work is based on his personal observations and experiences during the Philippine Revolution.
* "The Filipino People: Their Culture, History, and Struggle for Independence" (1903): This work examines the cultural, historical, and political landscape of the Philippines.
Blumentritt was a prolific writer and his works contributed significantly to the understanding of the Philippines. His works on the Filipino language and culture are particularly important. He also wrote numerous articles and essays on various aspects of Filipino life.
In addition to his scholarly works, Blumentritt was a staunch supporter of the Filipino struggle for independence. He actively campaigned for Philippine self-governance and was considered a close ally of Rizal.