A method is described for the preparation from hemolytic streptococci of extracts containing a soluble precipitating substance.

By the use of such extracts, it is shown that nearly all members of this family yield a common precipitable substance.

So far, therefore, as concerns the precipitin reaction, the hemolytic streptococci form a practically homogeneous group.

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Copyright, 1924, by The Rockefeller Institute for Medical Research New York
1924
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