series of stories published between 1915 and 1917". Conversely, he had a sympathetic attitude toward Japan, setting stories there and coauthoring a book on ju-jitsu with a noted Japanese adept in the art. Hancock's experience as a war correspondent provided inspiration for books about the Spanish–American War. He also published books on physical fitness and an Encyclopedia of Knowledge and Manners, and served as the editor of a "History of West Point". In a magazine article he warned of the dangers of smoking, at a time when such dangers were not widely known. He was also apparently a sports writer and an early Western expert on Jiu-Jitsu. Much of Hancock's writing had a patriotic character, his books and stories having a considerable proportion of military heroes placed in settings ranging from the American Revolutionary War, through the Spanish–American War and the First World War, and up to an imaginary German invasion of the United States (see following section). In addition to his writing activity, Hancock organized the Ferguson-Hancock Laboratories together with Prof. George A. Ferguson in 1908. Hancock died of liver ailments at his home, in Blue Point, Suffolk County, New York on March 12, 1922. Despite the enormous amount of material published by Hancock, some of his biographical details are not completely clear. The 1920 United States Federal Census contains the following: "H. Hancock, Birth: abt 1868 – Massachusetts Residence: 1920 – Brookhaven, Suffolk, New York". This seems to refer to Harrie Irving Hancock, but it is not completely certain—hence the above question mark following the date of his birth. According to Gene Horton of Blue Point, Hancock is buried in an unmarked grave at the Blue Point Cemetery. One Hancock book still in print is The Complete Kano Jiu-Jitsu (Judo), co-authored with Katsukuma Higashi and originally published by G. P. Putnam & Sons in 1905 in New York (presently republished by Dover Publications). "The Invasion of the United States" Hancock's four-book series The Invasion of the United States, published in 1916, depicted a fictional invasion of the United States by Germany in 1920–21—reflecting, and to some degree helping to intensify, the shift of American public opinion towards getting involved in the First World War. It was an American representative of the subgenre known as invasion literature which originated in Britain and was frequent in the early Twentieth Century. This kind of book was criticised —by some politicians at