In the following papers the term “Anaphylactic antibody” has been replaced by the word “Sensitizin.” This has the advantage of brevity. The word is formed on the analogy of the words precipitin and agglutinin, and carries its own significance—namely that substance which confers sensitization. No distinctions are at present known between the substance responsible for active, and that for passive sensitization, so that both are covered by this term. Besredka some years ago suggested “Sensibilisin,” but this is foreign to the spirit of the English tongue, being constructed on the root of the French verb “Sensibiliser” (to sensitize). “Anaphylactin,” a term suggested by Anderson, had been used in a different sense by Gay and Southard, which seems to preclude its adoption.

Friedberger (5) was among the first to maintain the identity of precipitin and sensitizin, basing his belief on the fairly constant ratio between these two substances in various sera.

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