An amiable disposition and good temper are very desirable. A violent fit of passion may exert so peculiar an influence in changing the natural properties of the milk, that a child has been known to be attacked with a fit of convulsions after being suckled by a nurse while labouring under the effects of a fit of anger. The depressing passions frequently drive the milk away altogether. It is hence of no small moment, that a wet-nurse be of a quiet and even temper, and not disposed to mental disturbance. 3. ARTIFICIAL, FEEDING, OR BRINGING UP BY HAND. Extreme delicacy of constitution, diseased condition of the frame, defective secretion of milk, and other causes, may forbid the mother suckling her child; and unless she can perform this office with safety to herself, and benefit to her infant, she ought not to attempt it. In this case a young and healthy wet-nurse is the best substitute; but even this resource is not always attainable. Under these circumstances, the child must be brought up on an artificial diet "by hand,"--as it is popularly called. To accomplish this with success requires the most careful attention on the part of the parent, and at all times is attended with risk to the life of the child; for although some children, thus reared, live and have sound health, these are exceptions to the general rule, artificial feeding being in most instances unsuccessful. THE KIND OF ARTIFICIAL FOOD BEFORE THE SIXTH MONTH. It should be as like the breast-milk as possible. This is obtained by a mixture of cow's milk, water, and sugar, in the following proportions:-- Fresh cow's milk, two thirds; Boiling water, or thin barley water, one third; Loaf sugar, a sufficient quantity to sweeten. This is the best diet that can be used for the first six months, after which some farinaceous food may be combined. In early infancy, mothers are too much in the habit of giving thick gruel, panada, biscuit-powder, and such matters, thinking that a diet of a lighter kind will not nourish. This is a mistake; for these preparations are much too solid; they overload the stomach, and cause indigestion, flatulence, and griping. These create a necessity for purgative medicines and carminatives, which again weaken digestion, and, by unnatural irritation, perpetuate the evils which render them necessary. Thus many infants are kept in a continual round of repletion, indigestion, and purging, with the administration of cordials and narcotics, who, if their diet were in quantity and quality suited to their digestive powers, would need no aid from physic or physicians.