CURIOUS.—Yawning is a deep and prolonged inspiration (drawing air into the lungs). It occurs commonly when the person is too tired or too lazy to breathe properly. Cough is a sudden spasmodic expiration (forcing air out of the lungs) with the mouth open, following a deep inspiration. During coughing the glottis (the slit through which the air has to pass in order to enter or leave the lungs) is closed at first and then opened. Cough is the natural and only method of clearing the lungs. Sneezing is a short, sudden expiration following a deep inspiration with the mouth shut. Its object is to clear the nose from something “tickling” it. Hiccough is an irregular involuntary expiration usually due to irritation of the lungs by a stomach distended with gas. AN INQUIRING SISTER.—Your brother is indeed unfortunate, for the condition of his face is one which is most difficult to eradicate. The disease is known as “sycosis,” and often follows the use of a razor which has been inoculated with very virulent germs. Abroad all barbers are compelled to disinfect their razors after using them, and this disease is consequently less common than it is with us. In England a careless barber shaves one man with some skin disease and very often communicates the disease to his next customer. The disease is, as we said, a very chronic one. The only treatment which ever completely cures it is to pick out every hair in the beard and moustache—not all at once, but only those which have pustules at their roots. This is not such a painful undertaking as it reads, for the hairs are loose and come out easily. The face should afterwards be covered with sulphur ointment. It is a formidable disease and needs careful and energetic treatment. EILEEN.—The best treatment for warts is to wash the hand thoroughly with soap and hot water and leave the hand soaking for ten minutes. Then dry the hand and surround the wart with vaseline. The vaseline is to protect the healthy skin from the caustic, and must not be placed upon the wart itself. Now drop one drop of glacial acetic acid upon the wart, leave it a couple of minutes and then drop on another drop of the acid. Finally rub the wart all over with a stick of nitrate of silver (lunar caustic). This treatment may have to be repeated. Warts are usually due to irritation of the skin. They are practically the same thing as corns. A GIRL OF TWENTY.—It is difficult to be certain what causes your baldness, but probably it is “alopœcia areata.” But if it is this, it has existed for a considerably longer time than is usual. We advise you to paint the bald spots with tincture of iodine every day until the places feel slightly sore. As soon as this occurs, leave off the treatment till the places become well again.