In preparing this diet, it is highly important to obtain pure milk, not previously skimmed, or mixed with water; and in warm weather just taken from the cow. It should not be mixed with the water or sugar until wanted, and not more made than will be taken by the child at the time, for it must be prepared fresh at every meal. It is best not to heat the milk over the fire, but let the water be in a boiling state when mixed with it, and thus given to the infant tepid or lukewarm. As the infant advances in age, the proportion of milk may be gradually increased; this is necessary after the second month, when three parts of milk to one of water may be allowed. But there must be no change in the kind of diet if the health of the child is good, and its appearance perceptibly improving. Nothing is more absurd than the notion, that in early life children require a variety of food; only one kind of food is prepared by nature, and it is impossible to transgress this law without marked injury. If cow's milk disagree with an infant--and this is sometimes unfortunately the case, even from its birth ass's milk,--diluted with one third its quantity of water, may be given as a substitute. I am now attending a lady in her fourth confinement, who is unable, from defect in her nipples, to suckle her children. The first child had a healthy wet-nurse, and has grown a fine healthy lad. The second, a girl, was unfortunate in her nurse, she being of a strumous and unhealthy constitution, although to a casual observer bearing the appearance of health. The child lived only three months, and the nurse died of a rapid consumption shortly after. This discouraged the mother from adopting wet-nurse suckling for the third child (a great error); and an artificial diet of cow's milk was resorted to. The third day from commencing this plan, flatulence, griping, purging, and vomiting came on, one symptom quickly following the other; the child wasted, and on the sixth day had several convulsive fits. The diet was immediately changed for ass's milk, and in less than twelve hours the sickness and purging ceased; the flatulence was relieved; the motions, from being green, watery, and passed with great violence and pain, became of a healthy consistence and colour, and the screaming ceased. The symptoms did not return, the child thrived, very soon consuming regularly one quart of the ass's milk daily, and is now a fine healthy girl two years old. A fortnight since the parent was confined with a fourth child. Cow's milk was given to it for two or three days (from the difficulty of obtaining that of the ass), the same train of symptoms, precisely, came on with which the third child had been affected, which again gave way upon following up the same plan of diet--the substitution of the ass's milk for that of the cow. The evident conclusion from this is, that the breast-milk of a healthy woman is incomparably the most suitable diet for the infant; but that, if she be not of a healthy