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n studying the story of life among the plants, you will remember that we learned that in most plants the male and female organs of sex were in the same flower. Among the lower forms of animal life, we find both the male and female natures in the same animal. The oyster furnishes a good example. These little animals are surrounded with and fastened to a very hard and heavy shell. These animals live in great masses and their shells are cemented together. Growing in this way they cannot move about, or mix and mingle with each other. The mother parts of the oyster produce little eggs which are fertilized by a substance formed by other organs containing the father nature. The fertilized egg, when laid, floats off and becomes attached to the shell of some oyster on a nearby rock.{ Later, it hatches and the little baby oyster forms about its body a hard shell that is made larger as the little animal grows. In this way the little oysters come into the world. Among the oysters, we find the sam