The best preventive of recurrent colds is the judicious use of the sponge or cold shower bath. The ordinary bath should usually be of a temperature not disagreeable to the body, but after the question of cleanliness has been attended to, an application, either by means of a sponge or shower, of ordinary cold water should be made. This should be of short duration, and friction with a coarse towel follow at once. When properly conducted, a reaction sets in so that there is no danger from this, and the toning effect of the method is of the utmost value in the prevention of colds. This applies, of course, only to persons in ordinarily good health. Even in these cases there are rare occasions in which this method is not advisable, and it may on general principles be stated that it should not be used by persons who do not react promptly. As stated, however, the application of cold water should be only momentary. The daily application of cold water to the throat and chest is also a useful practice for strengthening these parts. In addition to these means there are certain injurious conditions that it would be well to avoid. One almost universally present in large cities is that of dust. The constant inhalation of the small particles of sand and of organic impurities of which dust is composed has an irritating effect on the delicate lining of the nose and throat, which may develop a chronic inflammation, resulting in injury to both the throat and ear. This evil, however, can be prevented by the artificial watering of our streets. Excessive tobacco smoking produces injurious effects in the nose and throat. Of all forms of smoking, the cigarette is the most injurious, and allowing the smoke to pass through the nostrils the most dangerous. Occasionally ladies inhale the smoke of a closed room where the male members of the household are smoking, and this is injurious to a delicate throat. Loud and excessive talking is sometimes a factor in throat diseases. The former is more apt to be exercised in transit in our steam or electric cars, and members of the theatrical profession realize this so well that they rarely use their voice while traveling. In excessive talking, in addition to the mechanical wear and tear of the throat, the respiration is usually spasmodic, a combination that is likely to lead to evil results. At puberty, when the voices of boys and girls are changing, the former sometimes almost an octave and the latter usually a note or two, special care should be taken of the voice, and singing or vocal exercises should be discontinued until the change has been finally established.