The conclusions I would draw from this work are merely those stated in a former paper.

1. The results obtained by injections of streptococci are different from those produced by Micrococcus rheumaticus.

2. Micrococcus rheumaticus cannot be regarded as an attenuated streptococcus, nor acute rheumatism as an attenuated streptococcal pyæmia.

3. In uncomplicated cases of acute rheumatism the organism may not be found in the blood or in the joint exudates.

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