The oxidation product contains at least three distinct substances, benzoic acid, a substance melting at 200 degrees and—which is probably p-acetyl benzoic acid and a third substance melting at 110 degrees. _THE IRON ACIDS._ The resinous material used and spoken of as the IRON ACIDS is the material prepared and so named under the “Method of Separation”. PHYSICAL PROPERTIES:—Transparent and reddish brown in color, oily in consistency and has a characteristic tea like odor, heavier than water, freely soluble in benzol, ether, alcohol and acetone, but insoluble in petroleum ether and water. This resin constitutes about eighteen percent of the total ester resins. By qualitative tests it was shown that the acids contained only carbon, hydrogen and oxygen. Combustions made on the iron acids gave the following results. Wt. of boat 2.6950 2.6950 Wt. of boat and substance 2.8470 2.8495 Wt. of substance .1520 .1545 KOH bulb 50.9620 51.0805 Bulb and CO2 51.3370 51.4610 Wt. of CO2 .3750 .3805 Carbon equivalent .1023 .10376 Sulphuric acid tube 76.2448 76.3450 Tube and water 76.3400 76.4453 Wt. of water .0952 .1003 Hydrogen equiv. .0106 .01114 Percent Carbon 67.3% 67.2% Percent hydrogen 7.0% 7.2% Percent Oxygen 25.7% 25.6% An analysis of the iron salt obtained by precipitation from the potassium soap gave the following data. Wt. of substance used .2955 .3387 Wt. of FeSO4 .0445 .0509 Ferric equiv. .03208 .03676 Percent Iron 10.85% 10.85% The following method was used in making the above analysis. The weighed material was ignited in a platinum crucible by gently heating until the combustible gases formed were given off. The crucible was then strongly heated until the carbonaceous material was completely burned off. The residue was weighed and the percentage of iron determined. Expressed as the ACID NUMBER, or the number of milligrams of KOH required to neutralize the free acids in one gram of the substance, the following data was obtained. Ferric equivalent .03208 .03676 Fe expressed as KOH equiv. .0965 .1107 Wt. of material used .2955 .3387 Mg. of KOH per gram 326.6 326.7 Acid number 326.6 326.7 The following gives the ACID NUMBER obtained by direct titration of the Iron acid. The method is the same as that used in getting the titration value of the Barium acid.