The field of bacterial physiology illustrates some of these patterns of innovation in normal science. Bacterial physiology did not emerge as a distinct specialty until the mid-1940s, when systematic efforts were made (especially in Britain) to organize societies, journals, training programs, and patronage net- works for "general microbiology," as the discipline was then called. However, the fundamental ideas and methodologies of bacterial physiology had already been worked out between about 1915 and 1940. In this period, the nascent re- search field (...) developed under the aegis of half a dozen disciplines in half a dozen countries. By 1940 there were active centers of research in bacterial physiology at the Pasteur Institute in Paris; at the Rockefeller Institute in New York; in agricultural schools at the universities of Iowa, Wisconsin and Helsinki; in bi- ology departments at Stanford University, the University of Delft, and California Institute of Technology; in biochemistry at Cambridge University; and in bacteriology at the Middlesex Hospital in London and the London School of Hygiene. (shrink)