“…Experiments with a small series of cultures indicated that the sensitivity and accuracy of the method are superior to those of methods previously described (e.g., Chapman, 1944c). Moreover, other bacteria are so completely inhibited that it is possible to use a considerably heavier inoculum than was possible in former methods, and enterococci, which are about the only organisms that cause interference on tellurite-treated (Chapman, 1944a) alkaline bromthymol blue lactose agar (Chapman et al, 1937) rarely grow on 7.5 per cent NaCl phenol red mannitol agar.…”