In a previous communication,1 evidence was brought to show that peptization and colloid stability can occur in the absence of ions. It still remained to find whether such behavior was exceptional or usual in the case of non-polar liquids as dispersion media.Chemical literature contains numerous references to colloid systems in benzene and other hydrocarbons. For the purposes of a preliminary discussion, we shall classify these organosols according to the methods employed in preparing them, since the latter at least indicate the chemical composition of the dispersed phase,-a point on which other data often are lacking.Among the dispersion methods, electrical dispersion was resorted to by Svedberg2 to obtain sodium and potassium sols in ligroin, pentane and liquid methane. In spite of the painstaking precautions taken to insure the purity of the solvent and prevent its decomposition by the oscillatory discharge, the resulting sols were unstable.Hall50 prepared dispersions of aluminium (and apparently also of silver, copper, lead and iron) by means of a 1000 v. a.c. arc in "high grade transformer oil." In some cases, the dispersed phase settled out rapidly (f. inst. copper in 24 hours).