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The effects of nonelectrolytes(ureas,amino acids,sugars)on the cloud point(CP)of nonionic surfactantTriton X-114(TX-114)and tetra-n-butylammonium bromide(TBAB)system were studied.Ureas as well as thioureasincreased the CP.Behaviors of amino acids depended upon their nature.Nonpolar and uncharged polar anlino acidswere less effective in changing the CP.However,tryptophan and phenylalanine increased the CP sharply.Acidicamino acid(aspartic acid)and sugars decreased the CP.The results were explained in terms of their effect on waterstructure.Amino acids got solubilized either in the micellar interior or in the bulk phase.