MADDALENA.—Yes; you had better see a medical man. Your symptoms may be due to anæmia, nervousness or heart disease. Of these the last is infinitely the least likely. Anæmia is the probable cause, and is, moreover, the simplest to cure. AILING.—There are two questions that we ask every dyspeptic—how long do you take over your meals? how much do you eat at each meal? ONE OF FIVE.—1. Dilute the sulphur ointment with an equal quantity of lanoline. Otherwise follow out exactly the advice we gave to “Fair Isabel,” April 9, 1898. You are at the age when acne is most common in girls.—2. The white marks on the nails which trouble your sister are very commonly found. The only way to prevent them is to trim the nails carefully; but do not scrape the nails, as this of itself will sometimes produce opaque patches. About once a week rub the nails over with vaseline or cold cream. MUCH FRIGHTENED.—On page 63 of the present volume you will find an “answer” dealing at some length with the question of the causation of typhoid fever by oysters. MINERVA.—1. There is no objection to using cocoanut oil for the hair if you like it.—2. No; five feet two inches is by no means short for a girl of fourteen and a half—rather the reverse, in fact. During childhood and adolescence people increase chiefly in weight during the winter, and chiefly in height during the summer. A READER.—“Headache” is one of those symptoms which are met with in a very large number of affections. It is not a specialised symptom pointing to one organ definitely as the seat of disease. It is chiefly met with in the following ailments:—1. Injury, or disease of the brain. In this headache is nearly always present—it is a persistent, intense pain. 2. Abnormal states of the blood. In the infectious fevers headache is extremely common. In typhoid fever it is always present at the beginning of the disease. Under this class of headaches from abnormal states of the blood must be considered the headaches of Bright’s disease, of anæmia, and of indigestion and biliousness. 3. Headache due to mental fatigue. According to which of these causes is at work, the seat of the headache will vary. If the head aches on top, anæmia is the probable cause. Aching of the back of the head is often associated with errors of refraction of the eyes—an extremely common cause of mental fatigue and headache. The various forms of biliousness give rise to headaches in different localities. Frontal headache, occipital headache, and a sense of fulness deep within the skull are all commonly met with in indigestion and biliousness. Fatigue of the brain is a common cause of headaches, and it is, we believe, the cause of your trouble. Overwork, too little sleep, innutritious food, badly-ventilated rooms and errors of refraction of the eyes, all produce fatigue of the brain and headaches. Then there is the “nervous headache,” about which nobody knows very much. To treat headaches it is first necessary to find out what produces them.