h of the special organs of sex; he begins to feel more manly; to enjoy the society of girls as never before; and desires to treat them with more attention. This is a time when, if he is wrongly taught, he may fall into great wrong-doing and injure himself, and not that alone, but those who are to come after him. I have not yet told you of the great responsibilities that come with this gift of sex."
Dr. Barrett rose and, bringing a book from the shelves, opened it and showed Carl an illustration, saying; "Did you ever see such a picture as this?"
[Illustration]
"What are they?" asked he. "They look like pollywogs."
"As much like them as anything. But they are not pollywogs. They have a bigger sounding name than that. They are called spermatozoa, or each one is a spermatozoon. They are so tiny that they are not visible except with the aid of a microscope, and yet they are alive and very active. They live and move in a fluid called semen, and they are the li