STUDIES ON THE ORIGIN OF BACTERIAL VIRUSES : I. THE INCIDENCE OF PHAGE-PRODUCING CELLS IN VARIOUS B. MEGATHERIUM CULTURES. II. THE EFFECT OF ULTRAVIOLET LIGHT ON THE INCIDENCE OF PHAGE-PRODUCING CELLS AND OF TERRAMYCIN-RESISTANT CELLS. III. THE EFFECT OF HYDROGEN PEROXIDE ON THE INCIDENCE OF PHAGE-PRODUCING CELLS AND OF TERRAMYCIN-RESISTANT CELLS. IV. CALCULATION OF THE INCIDENCE OF PHAGE-PRODUCING CELLS

I. The Incidence of Phage-Producing Cells in Various B. megatherium Cultures Analyses of small samples containing a few cells each show that lysogenic B. megatherium produces phage particles in groups of from 10 to 1000 depending on the megatherium strain and the culture medium. These groups probabl...

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