You will therefore at once see why saccharine substances, apt as they are to pass into a state of fermentation, are not suitable, and why it is better to employ a solution of-- Borax, twenty grains Glycerine, one teaspoonful Water, an ounce. Now and then the use once or twice a day in addition of a very weak solution of caustic, as two grains of lunar caustic to an ounce of water, in bad cases is necessary; but of this it must be left to the doctor to decide. TEETHING.--The transition is a very natural one by which we pass from the study of the dangers and difficulties which attend the feeding and rearing of young infants, to those which accompany _teething_. The time of teething is looked forward to by most mothers with undisguised apprehension, nurses attribute to it the most varied forms of constitutional disturbance, and doctors constantly hold forth to anxious parents the expectation that their child will have better health when it has cut all its teeth. The time of teething, too, is in reality one of more than ordinary peril,[9] though why it should be so is not always rightly understood. It is a time of most active development, a time of transition from one mode of being to another, in respect of all those important functions by whose due performance the body is nourished and built up. The error which has been committed with reference to this matter, consists not in overrating the hazard of the time, when changes so important are being accomplished, but in regarding only one of the manifestations--though that indeed is the most striking one of the many important ends which nature is then labouring to bring about. A child in perfect health usually cuts its teeth at a certain time and in a certain order, just as a girl at a certain age begins to show signs of approaching womanhood; and at length attains it with but slight inconvenience or discomfort. The two processes, however, have this in common, that during both, constitutional disturbance is more common, and serious diseases are more frequent than at other times, and the cause in both lies far deeper than the outward manifestation.