“…Given the enormous volume of literature that has accumulated over the last century, a complete historical review would exhaust both the reader and the writer. The reader therefore is directed to several excellent reviews and monographs for a more complete treatment of individual topics (Aulie, 1970;Allen and Allen, 1958;Burris, 1974Burris, , 1979Fred et al, 1932;Jensen, 1940Jensen, , 1965Mishustin and Shil'nikova, 1971;Postgate, 1982; David R. Benson • Microbiology Section, University pf Connectiwt,Storn,Connecticut 06268. Stewart, 1966;Wilson, 1940Wilson, , 1957Wilson, , 1958Wilson, , 1969.…”