There is one thing very remarkable in the growth of the human body. The foetus in the womb continues to increase more and more in equal periods, till the birth. The infant, on the contrary, increases less and less, that is in the same period of time, till the age of puberty, to which it seems to bound, as it were, at once. The foetus, for example, is an inch long in the first month, two inches and a quarter in the second; three inches and a half in the third; five inches and upwards in the fourth; six inches and a half, or even seven inches, in the fifth; eight inches and a half, or nine inches, in the sixth; eleven inches, in the seventh; fourteen inches, in the eighth; and eighteen inches, in the ninth. Although this measurement may vary in different children, yet if the child be 18 inches at its birth, it will hot increase more than six or seven inches in the first year after: that is, at the end of the first year, it will be 24 or 25 inches; of the second, 28 or 29 inches; of the third, only 30, or, at most 32 inches; and from this age till that of puberty, it will not advance more than one inch and a half, or two inches, in the course of each year. From these remarks it is evident that the foetus increases more in a month, towards the close of its residence in the matrix than the infant does in a year, till it arrives at the age of puberty; when Nature seems to make one grand effort to unfold the animal machine, and render her work complete. So essential is it, that the constitution of the nurse should be sound, and her juices untainted that we have many instances of diseases being imparted from the nurse to the infant, and from the infant to the nurse. Whole villages have been infected with the venereal virus, by nurses suckling the children of other women. Were mothers to suckle their own offspring it is probable the latter would be more strong and vigorous. The milk of a stranger must be less proper for them than that of the mother, for as the foetus is nourished in the matrix by a fluid, which bears a strong resemblance to the milk that is formed in the breasts, the infant, therefore, is already, as it were, habituated to the milk of its mother. The milk of any other woman, on the contrary, is a nourishment new to the child, and sometimes so different from the other that it is difficult to make the child take it: and if forced will sicken and languish, from not being able to digest the milk of the nurse; a circumstance which, if the consequences are not seasonably prevented by the substitution of another nurse, soon proves fatal.