Of these the most important are (a) bacteriolytic or lysogenic action, (b) agglutinative action, and (c) opsonic action.
The first of these, lysogenic or bacteriolytic action, consists in.
Furthermore, lysogenic action is not confined to the case of bacteria but obtains also with other organized structures, e.g.
Gruber and Durham showed that sedimentation occurred when a small quantity of the homologous serum was added to an emul:_on of the bacterium in a small test-tube, and found that this obtained in all cases where Pfeiffer's lysogenic action could be demonstrated.
Various observers had previously found that the serum of an animal immunized against (a) Lysogenic action.