In a continuation of previous work, the R F′ values have been determined for a number of isomeric phenols in three polar and three non-polar solvent systems. The use of ceric ammonium nitrate as a spot-locating agent for phenols has been continued and found to be of much value. Some correlation has been found between the R F′ value of some alkoxyphenols and the molecular weight of the substituent, especially with the meta and para isomers. With the ortho isomers internal bonding effects upset this relationship. Mineral spirits has been found to be a good indicator of the degree of polarity of a molecule.