symptoms, and yellowness of the skin lasting for some time. This is not seen readily during the stage of fever when the surface is reddened, but at that time may be detected by pressure on the skin for a minute, when the skin will present a yellow hue on removing the finger before the blood returns to the pressure spot. With fall of fever, and abatement of symptoms after two or three days, the patient, instead of going on to recovery may, after a few hours or a day or two, again become very feverish and have vomiting--perhaps of blood or black vomit--yellow skin, feeble pulse, failure of kidney action with suppression of urine, delirium, convulsions, stupor, and death; or may begin to again recover after a few days. Mild fever, slight jaundice, and absence of bleeding are favorable signs; black vomit, high fever, and passage of little urine are unfavorable signs. The death rate is very variable in different epidemics and among different classes; anywhere from fifteen to eighty-five per cent. Among the better classes it is often not greater than ten per cent in private practice. Heavy drinkers and those living in unfavorable surroundings are apt to succumb. =Prevention.=--Yellow fever, like malaria, is a preventable disease, and will one day be only a matter of historic interest. Dr. W. C. Gorgas, U. S. A., during 1901, by ridding Havana of the mosquito carrying the yellow-fever organism through screening barrels and receptacles holding water, and by treating drains, cesspools, etc., with kerosene, succeeded in also eradicating yellow fever from that city, so that in the following year there was not one death from this disease; whereas, before this time, the average yearly mortality had been 751 deaths in Havana. Spread of the disease is controlled by preventing access of mosquitoes to the bodies of living or dead yellow-fever patients; while personal freedom from yellow fever may be secured by avoiding mosquito bites, through protection by screens indoors, and covering exposed parts of the face, hands, and ankles with oil of pennyroyal or spirit of camphor, while outdoors.