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Streptococcus Lactis and the Streptococci of the So-called Lactic Group

Department of Dairy Industry, Cornell University, Ithaca, N. Y.

ABSTRACT

From the nature of the problem, any attempt to divide bacteria into more or less homogeneous aggregates that may be designated as "species" must of course be a rather arbitrary procedure. Be that as it may, every bacteriologist is engaged in the classification of bacteria; that is, he must deal with biological divisions containing closely related organisms, whether these entities be designated as species and varieties, or as groups and types.

However, I wish to make it clear at the outset that I have no fixed ideas on the subject of species in the lactic group of streptococci. I have no quarrel with those who wish to consider the group as consisting of one species, Streptoccoeus lactis, with its several varieties. Since, on the other hand, I spent much time twenty years ago helping to "prove" that Orla-Jensen's S. cremoris is a distinct species, I naturally cannot disagree very violently with those who wish to recognize that and other types as being entitled to rank as species.