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Measurements of the surface viscosity of monolayers of soap adsorbed from solution have been made by the oscillating bob method. Pure soaps, in which there is no hydrolysis, show no measurable surface viscosity but amphiphiles of sufficient hydrocarbon chain length produce enormous non-Newtonian surface viscosity. Above the c.m.c. of the soap, the insoluble amphiphile is dissolved from the monolayer into the interior of the solution. At the hydrocarbon soap solution interface, no surface plasticity has been observed. Some correlation of these results with emulsion stability has been found. Water in oil emulsifiers show interfacial plasticity.It has been pointed out by one of us 1 that the view generally accepted that lowering of the interfacial tension between oil and water to a small value confers thermodynamic stability upon emulsions cannot be true. A large decrease of y