A portion of the dry diazo compound was placed in a flask connected with a reflux condenser, and solid sodium carbonate and n-butyl alcohol added. No reaction took place at ordinary temperature so heat was applied. Decomposition started at 65° and evolution of hydrogen proceeded evenly and smoothly until all the diazo compound had disappeared. The alcohol, at first colorless, became an orange and finally a brown color. The solution was then refluxed an hour to ensure complete decomposition of the diazo compound. The smell of an aldehyde was evident indicating that the hydrogen reaction was taking place; the solution was tested with Schiff’s reagent and with ammoniacal silver nitrate with distinct positive results in both cases, showing aldehyde was present. The alcoholic solution was filtered from the sodium carbonate remaining, and the alcohol distilled off on an oil bath. A yellowish-orange porous solid was left in such a small amount that no derivatives could be made and studied. It was free from the diazo compound, shown by its giving no color with an alkaline solution of H acid. (2) With n-Butyl Alcohol alone. The previous experiment showed that n-butyl alcohol would decompose the diazo compound in the presence of sodium carbonate and replace the amino group by hydrogen, so this time a decomposition with the alcohol alone was tried. Decomposition took place evenly and smoothly as before at the same temperature, and the solution became a clear brownish-orange. Aldehyde was given off and tested for as before with positive results. The alcohol was removed by distillation and a thick brownish syrupy liquid was left. This was easily soluble in water, so was dissolved, filtered, and the solution used in the following experiments. At this point it is similar in every way to the solution obtained by Griffin (loc. cit.) from the diazo compound of para toluidine meta sulphonic acid. Subsequent preparations of this syrup were made in the above way with similar results in every case. The only precaution to be observed is that no part of the flask containing the reaction mixture be allowed to become too hot as the diazo compound is then decomposed violently leaving a grayish ash. A STUDY OF THE SOLUTION OBTAINED BY THE DECOMPOSITION OF THE DIAZO COMPOUND The syrup which remained after distilling off the n-butyl alcohol was a thick brown viscous fluid in all cases. It has an acid reaction and is completely soluble in water. On testing it showed the presence of sulphur in quantity and the absence of nitrogen. Some was dissolved in water, filtered, and evaporated on the water bath. After its volume had been considerably reduced it turned a very dark brown, then blackish, and smelled very tarry. It did not crystallize at all, finally becoming very black. To a drop on a watch glass, a drop and then an excess of concentrated hydrochloric acid was added but with no apparent result.