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An investigation was made into the relative merits of several media for counting salt-marsh bacteria. Although extracts of salt-marsh mud were superior to extracts of meadow soil, a nitrogenous medium, i.e. ZoBell's sea-water agar no. 2216, was apparently the least selective. For the saltmarsh muds studied, media with a salinity about the same as sea water gave the highest counts of bacteria, particularly for samples from the sali-cornietum. A possible correlation between this and the origin of the mud is discussed.
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