The specificity of antisera against crystalline serum albumin

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Abstract
Antisera prepared in the rabbit by injection of crystalline horse-serum albumin or crystalline human-serum albumin show a considerable diminution in specificity after more than one course of six to eight injections has been given.The ratio of precipitate nitrogen to antigen nitrogen at the optimal point is smaller in antisera obtained after one course of injections than in antisera derived from subsequent bleedings.In the case of antisera obtained from first bleedings, the ratio of precipitate nitrogen to antigen nitrogen determined at the optimal point with homologous antigen is of approximately the same value in both the antigen-antibody systems studied. The increase in the values of the ratios for antisera from subsequent bleedings is also the same for both systems.