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SVJhIhlARY' Indifl'erent ' strains of streptococci-j .e. strains which give no haemolysis or greening on blood-agar plates-frequently occur in cultures from dental root-canals. A scrological study of over 200 strains of these streptococci showed that about half of' them belonged to Lanceficld groups F, G or C. It was shown by cross-absorption that the group-antigen of indifferent streptococci of group F is identical with the group-antigen of haemolytic strains of group 17. .+rt from the group-antigen, five independent carbohydrate type-antigens, localized in the cell wall, were demonstrated in group F strains. These type-antigens were found in groups other than F, e.g. the type-antigen I was observed in haemolytic and indifferent strains of group G; the type-antigen I11 occurred in indifferent strains of group C.Several strains with a type-antigen but without group-antigens were observed. The presence of carbohydrate type-antigens in formamide extracts can causr confusing cross-reactions in the grouping procedure, unless strains without type-antigen are used for the preparation of sera.

R14,

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Traditionally, along with stages of the life cycle and changes in people's Wnancial status and their household composition, the commute distance has been identiWed as one of the main explanatory factors for residential locational preferences and subsequent migration Xows. In the Netherlands, telecommuting is rapidly becoming popular and is expected to aVect residential locational preferences. A hypothesis that can be raised is that telecommuting has an impact on the eVect that commute distance has on residential preferences. Based on this hypothesis, this paper investigates the role of telecommuting alongside the traditional factors currently explaining residential locational preferences. The paper provides evidence that, in the Netherlands, telecommuting has enabled people to commute longer distances. The eVect of telecommuting on the probability of relocating, however, is not signiWcant. Telecommuting appears to have a limited eVect on residential location preferences, but traditional factors, such as life cycle stages, remain the dominant explanatory factors.

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