ven to reac- tions of this type, the matter usually having been dismissed as some confusing phenomenon due to a defective technic or to an improperly produced toxin or antitoxin. It is the intent of this report to show that such reactions are not necessarily "accidents," but rather that they may be significant reac- tions, reactions which may very well prove to be of service in disclos- ing homogeneity in serological systems.
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