In diseases which are certainly caused by hemolytic strepto- cocci, such as puerperal septicemia, observations on the rise or fall of immunity to streptolysin may be significant in prognosis and may throw light on the patients' reaction to infection. 278 ANTIGENIC STREPTOCOCCAL HEMOLYSIN Observations on specific antistreptolysin in the sera of horses under- going immunisation with scarlet fever toxin may possibly be used to gauge the antitoxic value of the serum; preliminary observations show that there is some correlation between antitoxin and antihemolysin but whether they are distinct and separate or identical antibodies is at present uncertain.
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