SUMMARY: The preparation and use of tellurite‐egg agar (TEA), a medium for the isolation of coagulase positive staphylococci, are described. The medium, based on that of Ludlam (1949), was non‐inhibitory to coagulase positive staphylococci and colonies on it of these organisms could easily be distinguished from contaminating types. Comparisons were made between the medium and three other media in common use for the isolation of coagulase positive staphylococci.

SUMMARY: Tests carried out on coagulase positive staphylococci isolated from bulk milk supplies showed a nearly perfect relationship between α‐lysin production and pigment production at 42°. Ninety‐nine per cent of the organisms were classed as pathogenic, while 75% were probably responsible for sub‐clinical conditions in the udder.

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SUMMARY: A method described for the demonstration of penicillinase production by staphylococci, a modification of that described by Voureka & Hughes (1949), is less laborious than the original and gives results which are readily interpreted.