THE FUNCTION OF THE SPERMATOZOA.--God gave the male spermatozoa the power to move. To watch them under the microscope you would imagine you were looking into a bowl of water, in which there were hundreds of little fish all squirming around. But the most wonderful thing about them is, they can only move in an upward direction,--they seemingly cannot move downward, or sideways. If you think for a moment you will understand why God gave them this marvelous property. When the male semen is deposited in the female vagina, there are thousands of these minute, living, moving spermatozoa in it. The womb is above the vagina, and the female egg is in the womb, consequently, to reach this egg, the spermatozoa must travel upward. To travel in any other direction would be fruitless energy. There is only one female egg, but there are thousands of male eggs, or spermatozoa; it is easy, therefore, to comprehend how one of these spermatozoa should exactly be in line with the female egg in its upward path, since there are so many of them. It is only necessary that one should meet the female egg in order to impregnate it. The shape of the male principle, or spermatozoa, is exactly like a little tadpole, and you no doubt recall that a tadpole has a minute tail, the movement of which enables it to swim around. So has the spermatozoa, and by the incessant movement of this microscopic tail they all move upward as soon as discharged by the male. I told you that God gave the male-germ life. It is necessary now to explain the character of this life. It is very brief; it is estimated that they are active for two hours, and then become inactive, or die. The best way to explain the brief activity to your daughter, is to liken the spermatozoa, to a mechanical toy, which is wound up to go for a certain time. After it runs out it becomes inactive; this is exactly what happens to the little human tadpole. If during this brief life none of them has happened to reach the female egg, pregnancy does not take place and menstruation occurs. On the other hand, if this were not so,--if these spermatozoa were active for a longer period, pregnancy would almost be certain to take place every time the womb was not already occupied with a pregnancy.