Abstract
Data are presented which indicate that the forces of attraction between influenza virus and chicken erythrocytes are governed by an orderly mechanism which effects a proportional distribution of virus between erythrocytes and suspending fluid. For a unit mass of erythrocytes, the ratio of combined (sorbed) virus to free (unsorbed) virus is sufficiently constant over a wide range of virus concentrations to indicate compliance with the laws of mass action, or, perhaps, with the laws of simple adsorption; however, the ratio of combined (sorbed) virus to free (unsorbed) virus appears to be a parabolic function of the total quantity of virus.
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