The one thing which still remains to do, especially in the case of children in whom teething is not over, is to examine the mouth and ascertain the state of the gums, since some ailments are caused and others are aggravated by teething. A wise mother or an intelligent nurse will teach the child when well the little trick of putting out its tongue and opening its mouth to show its teeth when told to do so; and though it may sometimes indulge rather out of place in these performances when wished to behave especially prettily before strangers, yet when older it will quickly learn the proprieties of behaviour, and in the meanwhile you profit much by the lesson when illness really comes. Sometimes, however, infants who when well will open their mouth and allow their gums to be felt without difficulty, refuse to do so when ill; and it is always desirable that the mother or nurse whose duty it is to tend the sick child constantly, should not frighten it, or lose its confidence, by doing forcibly that which the doctor who comes occasionally may yet be quite right in doing. You will, however, generally get a good view of the mouth and throat in young infants by gently touching the lips with your finger: the child opens its mouth instinctively, and then you can run your finger quickly over its tongue, and drawing it slightly forward perfectly see the condition of the throat, feel the gums as you withdraw your finger, and notice the appearance of the tongue. Sometimes it is important to ascertain whether a tooth which was near coming through has actually pierced the gum, and yet the child's fretfulness renders it almost impossible to induce it to open its mouth. If now, while the nurse holds the child in her arms, you go behind her, you can, unseen and unawares, introduce your finger into its mouth and ascertain all you wish to know before the little one has recovered from its surprise.