Technische Berichte der Deutschen Chemischen Gesellschafi, vol. 41 (1915); H. Barkhausen, “Die Vakuumrohre und ihre Wirkungen (1924). (E. K. R.) 55I CATHER, WILLA SIBERT (1876- ), American inventor, was born July 18 on the Tide Flats, commonly known as the length of railway employees. President Wilson was utilised for the growth is removed and purified.