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This monograph by du Noüy with introductions by Alexis Carrel and Robert A. Millikan, concisely presents eleven chapters on surface equilibria as follows: technic; drop of the surface tension of colloidal solutions as a function of time; monomolecular layer of serum constituents; sodium oleate; egg albumin; characteristics of immune serum; influence of colloids on the crystallization of sodium chloride; surface equilibrium of complex colloidal solutions; interfacial tension; colloidality of solutions of proteins, serum and plasma; general conclusions. That a monograph has won the approbation of so eminent a physicist and biologist, stamps it as a contribution of first rank. Although all of the applications of this work may not be apparent now, the author in quoting from Claude Bernard, does "open up a new road."