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Harrie Irving Hancock (January 16, 1868 - March 12, 1922) was an American chemist and writer, mainly remembered as an author of children's literature and juveniles in the late 19th and early 20th centuries, and as having written a fictional depiction of a German invasion of the USA.
I read this as part of my exploration of Eastern martial arts' expansion in the U.S.; this guide was written in 1904 and describes Jiujitsu techniques. Racist in parts (e.g., references to "the wily Oriental"), and some don't seem clearly effective, but the remarkable photos of men in business dress performing techniques are fun. It also is, perhaps in its own way, progressive for its day, highlighting the "scientific" nature of Jiu-jitsu and encouraging women to train in it as well.