Wt. of substance .2450 .2472 Cc of alkalie 2.2 2.3 KOH equiv. .01232 .01288 KOH equiv. per gram 53.87 52. An attempt was made to saponify some of the iron acid, but it was impossible. The alcohol was partially distilled off, and the acid freed by making the mass acid with sulphuric acid, and shaking out with ether. The ether was distilled off, but the remaining acid had different physical properties from the acid with which the experiment was started. It was lighter in color, and solidified at zero degrees. At room temperature it was almost solid. On ignition it left no ash. This probably is a polymerization product of the original acid. Since many organic acids whose salts cannot be prepared by the ordinary methods can be prepared by passing dry ammonia gas through a solution of the acid in anhydrous ether, this method was tried with the iron acid. The iron acid was dissolved in anhydrous ether, and the dry ammonia gas was bubbled through this ether solution. At first no change was noted, but after several minutes there was a flocculent thready precipitate formed which was light brown in color. The experiment was repeated. At first the precipitate was a very light brown, but after forming it quickly darkened. After standing a few hours the flocculent precipitate changed to a sticky brown mass. This same change was produced immediately if the precipitate was exposed to the air. The resulting mass had no odor of ammonia. The flocculent precipitate formed at first was probably the ammonium salt of the iron acid, which like most ammonium salts, it was precipitated due to its insolubility in ether. Due to the ease of hydrolysis this salt immediately decomposed to the acid and ammonia when traces of moisture were present. _OXIDATION OF THE IRON ACIDS AND THE FREE ACIDS._ When the iron acids were oxidized in the same manner as the barium acids the amount of the oxidation product formed was about one fourth of that produced with an equal amount of the barium acids. The time necessary to completely oxidize the iron acids was much less then required for the barium acids. On sublimation the iron acid gave a product melting at 110 degrees Centigrade and is probably identical with the one formed from the barium acids. The iron acid also yielded a sublimate melting at 208 degrees C. The free acids when oxidized in a like manner gave as one of the products a low melting crystalline compound that contained nitrogen. The iron acid although related to the barium acid as shown by the formation of a common oxidation product is different in structure as shown by the difference in the amount of the oxidation product formed and the time to complete the oxidation. _THE ALCOHOL RADICALS AND UNSAPONIFIABLE MATERIAL._