Abstract
Summary1. Extracts of mayfly, fly, cockroach, cricket and silk have been investigated by hemagglutination and agar precipitation technics. 2. Evidence has been obtained for the presence of specific antigens in each extract as well as antigens common to one or more of the other extracts. 3. The minimum number of antigens in each extract has been determined by agar diffusion. 4. The agar diffusion and hemagglutination data provide information helpful in purification studies.
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