_Koch’s tuberculin_ was administered to five anæsthetic, three tuberous, and three mixed cases, as a rule, daily, from January 8th to May 8th. The dose at the commencement was 1 milligramme, and in several cases as much as 320 milligrammes were finally injected. The injections were made, sometimes daily, sometimes at intervals of a few days, according to the degree of reaction which followed the injections. In some cases the injections had to be stopped very soon, because they produced fresh leprous eruptions; and in one case bacilli were found in the blood. It seemed as if the tuberculin had set the bacilli afloat. We came to the following general conclusions:--(1) Tuberculin administered to lepers produces a general and local reaction, usually forty-six hours after the injection, seldom after twelve hours, and very seldom after two to three days. The local reaction becomes evident later. (2) These reactions do not beneficially influence the leprosy, they rather aggravate the disease by causing fresh eruptions just as iodide does. (3) Tuberculin does not kill the lepra bacillus. (4) Immunity against tuberculin can be attained, but this immunity does not influence the progress of leprosy. Dr. Carreau, in Guadaloupe, treated a leper with _chlorate of potassium_, he believed with great benefit; he gave the remedy in enormous doses. Dr. Hjort had, already, in 1838-39 tried this remedy without effect. Dr. Beaven-Rake has also tried the remedy according to Dr. Carreau’s directions, but also without result. Dr. Danielssen, too, tried it, but without any benefit. During the last few years the following remedies have been tried in the Lungegaard’s hospital: Hydroxylamin, Europhen, Naphthol, Salol, Methylene blue, Aristol. _Hydroxylamin_ forms colourless crystals, easily soluble in alcohol and glycerine. It is decidedly poisonous, and is, according to some authors, a more powerful reducing agent than chrysarobin or pyrogallic acid; 2 to 5 hydroxylamin to 20 glycerine and 80 alcohol, was painted on the patches of four maculo-anæsthetic lepers. In two of them there developed, after the painting, an erythema, during the persistence of which the painting was discontinued. The painting was continued for two months, and then a 2 per cent. hydroxylamin ointment was applied, but as no amelioration could be noted after four or five months, the remedy was laid aside. In four tuberous patients the painting could only be continued for two or three days, because the spots re-acted severely, grew red and painful, and vesicles formed. The tubers somewhat diminished, but otherwise the condition remained unaltered.