 The data thus collected should be invaluable as a guide in the organization of American engineering forces should history ever repeat itself.With the retirement of Major Cattell, on September 30, 1919, from the United States Army, ill health overtook him, and he did not again take up the active practice of the profession of civil engineering.He spent some months in Philadelphia, Pennsylvania, and returned to California in January 1920, where he resided in Alhambra until his death, after a long illness, on October 10, 1920.