is developed during the various months of pregnancy.
Absolutely exact measurements cannot be given, but the following
approximate measurements are correct:

[Illustration: 1. EMBRYO BETWEEN ONE AND TWO WEEKS OLD.
2. EMBRYO ABOUT FOUR WEEKS OLD.
3. EMBRYO ABOUT SIX WEEKS OLD.
(Illustrations are double the actual size.)]

At the end of the first month (lunar) it is about the size of a
hazelnut. Weighs about 15 grains.

At the end of the second month it is the size of a small hen's egg.
The internal organs are partially formed, it begins to assume a human
shape, but the sex cannot yet be differentiated. Up to the fifth or
sixth week it does not differ much in appearance from the embryos of
other animals.

At the end of the third month it is the size of a large goose egg; it
is about two to three and a half inches long. Weighs about one ounce.

At the end of the fourth month the fetus is between six and seven
inches long and weighs about five ounces.

At the end of the fifth month the fetus is between seven and eleven
inches long, and weighs eight to ten ounces.

At the end of the sixth month it is eleven to thirteen inches long and
weighs one and one-half to two pounds. If born, is capable of living a
few minutes, and it is reported that some six months' children have
been incubated.

At the end of the seventh month the fetus is from thirteen to fifteen
or sixteen inches long and weighs about three pounds. Is capable of
independent life, but must be brought up with great care, usually in
an incubator.

At the end of the eighth month the length is from fifteen to
seventeen inches, and weight from three to five pounds.

At the end of the ninth month the length of the fetus is from sixteen
to seventeen and one-half inches, and weight from five to seven
pounds.

At the end of the tenth lunar month (at birth) the length of the child
is from seventeen to nineteen inches and the weight from six to twelve
pounds; the average is seven and a quarter, but there are full term
children weighing less than six pounds and more than twelve; but these
are exceptions.

CHAPTER FOURTEEN

THE AFTERBIRTH (PLACENTA) AND CORD

How the Afterbirth Develops--Bag of Waters--Umbilical Cord--The
Navel--Fetus Nourished by Absorption--Fetus Breathes by Aid of
Placenta--No Nervous Connection Between Mother and Child.

Whatever part of the womb the ovum attaches itself to is stimulated to
intense activity, to