A fairly large number of salts, especially halides and nitrates, have been found to be soluble in acetic acid. All sulfates are very slightly soluble.2. Double decomposition reactions have been found to take place quite readily in this solvent. A number of such reactions have been described.3. Solvolysis does not occur in acetic acid solutions to any marked extent.4. Analogies have been pointed out between the behavior of certain acetates in acetic acid and that of the corresponding hydroxides in water.