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Cultures of Serralia even when unpigmented can be identified by their flagella which have an unusual coiled shape. Serratia cultures isolated from clinical materials are lactose negative, imvic − − + +, sulphide negative, anerogenic, and have a distinctive pattern of fermentative abilities. A different Serratia, not so far encountered in clinical materials, is also described. The literature on isolation of Serralia from man and animals is summarized.

The organism originally isolated by Castellani (1914) from "collumbensis fever" and later (Castellani, 1938) assigned by him to the gentus Salmonella, has been infrequently reported in the Western Hemisphere. The only records that have been located are a note reporting Taylor's (1924) isolation of what is now strain 595 of the American Type Cullltuire Colleetion, the record in the catalogue of that collection mentioning the isolation by Shaw of their strain 4298, and an indirect reference by Jordan and M\IcBroom (1934) to the occurrence of the organism in Panama. The organism has been encountered in Ceylon, in the tropics of Asia and Africa, in the Balkans, and also in ILondon, and reported in the papers of Fernando

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