Precautions such as these are not needed in the case of the other kinds of worms. Thread-worms, however, are best attacked in their habitation; that is to say, in the lower bowel, by means of lavements. It is, therefore, desirable before they are administered that the bowels should be emptied by a dose of castor oil.
The only other caution which remains for me to give refers to the peculiar effect which salicine, a very valuable medicine, especially in the case of thread-worms, has upon the urine. It sometimes turns the urine of a greenish-yellow, often of a red colour, as though it were mixed with blood. The appearance, however, has no grave meaning, but is due simply to a chemical action of the medicine on the colouring matter and salts of the urine.
There still remain some local ailments of parts connected with the process of digestion, concerning which a few words must be said.
=Ulcerated Mouth.=--First, with reference to the _sore-mouth_ of children. I have already noticed a form of inflammation and ulceration of the gums sometimes met with during teething, but the sore-mouth of which I am now about to speak is often quite independent of that process; though it may sometimes be found associated with it, and is indeed rarely met with after five years of age. In almost all instances it is preceded and attended with symptoms of indigestion, during the course of which the mouth becomes inflamed, hot and red, and small very painful shallow ulcers with sharp-cut edges, and a little yellowish deposit on their surface, appear at the edge of the tongue, on the inside of the mouth, and especially on the inside of the lower lip, and the adjacent surface of the gum. Successive crops of these little ulcerations not unfrequently appear, so that for many weeks the child may be kept by them in a state of extreme discomfort; swallowing, and even speaking being the occasions of considerable suffering.
It is seldom that nursery remedies, and the so-called cooling medicines, though often of some service, suffice to get rid of the ailment, which for the most part needs judicious medical treatment, and local as well as constitutional measures. Now and then this condition comes on in the course of measles, and is then sometimes of serious importance.