traded by amyl alcohol, and precipitated in great part by basic lead acetate. Its solutions show no absorption bands, thus differing from solutions of the urorose'fu of Nencki and Sieber. Solutions in ether and in chloroform show a beautiful green fluorescence ; a solution in amyl alcohol is weakly fluorescent, one in ethyl alcohol not at all. A process is given for the extraction of this coloring matter from the urine. CHANGES EFFECTED IN THE URINE BY A MILK DIET.