SummaryInterfacial phenomena are direct,ly involved in the adhesion of a stJrain of Chlorella, a unicellular alga, to glass surfaces in simple ionic solutions. The principal mechanisms governing the adhesion appear to be electrostatic interaction between electrical dortble layers arid various specific surface interactions resulting from surface heterogeneity and ion adsorption. Under most conditions the algal cells and glass surfaces have negat,ive zeta potentials, and adhesion to gl will not occur; but if, for example, FeC13 is added to an algal-glass system immersed in 0.05M NaC1, the algal and glass surfaces will possess very different zeta potentials, and adhesion will be strongest Iinder those conditioiis which produce the great'est difference in zeta poentials. Prior pretreatment and usage of glass apparatus greatly affect the glass zeta potentials and the adhesion of algal cells to glass. Ail apparatus for measuring a relative set of numbers representing the force of adhesion of algal cells is described.

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