TIME OF USING THE BATH.--When resorted to for sudden illness, the bath must of course be employed at any time needed. When used for any complaint of long standing, or a measure of hygeiene, as a general rule, it should be taken between breakfast and dinner, about two hours after the former, or an hour and a half before the latter. This implies that the infant should never be put into the bath after having been freely nourished at the breast. Neither should it ever be used when the child is in a state of free perspiration from exercise, or on awaking from sleep. Chap. III. OF TEETHING, AND HINTS ON THE PERMANENT OR ADULT TEETH. The infant at birth has no teeth visible: the mouth is toothless. It possesses, however, hidden in the jaw, the rudiments of two sets. The first of these which makes its appearance, are called the Temporary or Milk Teeth; the second, the Permanent or Adult Teeth, and these come up as the former fall out, and so gradually replace them. Sect. I.--ON TEETHING. THE MANNER IN WHICH THE TEMPORARY OR MILK-TEETH APPEAR.--The first set of teeth, or milk-teeth as they are called, are twenty in number; they usually appear in pairs, and those of the lower jaw generally precede the corresponding ones of the upper. The first of the milk-teeth is generally cut about the sixth or seventh month, and the last of the set at various periods from the twentieth to the thirtieth months. Thus the whole period occupied by the first dentition may be estimated at from a year and a half to two years. The process varies, however, in different individuals, both as to its whole duration, and as to the periods and order in which the teeth make their appearance. It is unnecessary, however, to add more upon this point. Their developement is a natural process. It is too frequently, however, rendered a painful and difficult one, by errors in the management of the regimen and health of the infant, previously to the coming of the teeth, and during the process itself. Thus, chiefly in consequence of injudicious management, it is made the most critical period of childhood. Not that I believe the extent of mortality fairly traceable to it, is by any means so great as has been stated; for it is rated as high as one sixth of all the children who undergo it. Still, no one doubts that first dentition is frequently a period of great danger to the infant. It therefore becomes a very important question to an anxious and affectionate mother, how the dangers and difficulties of teething can in any degree be diminished, or, if possible, altogether prevented. A few hints upon this subject, then, may be useful. I shall consider, first, the management of the infant, when teething is accomplished without difficulty;--and, secondly, the management of the infant when it is attended with difficulty. MANAGEMENT OF THE INFANT WHEN TEETHING IS WITHOUT DIFFICULTY.