ABSTRACT
THERE are six great haunts of life—the shore of the sea, the open sea, and the depths of the ocean, the fresh waters, the dry land, and the air with its birds and bats and butterflies. We have studied a little the three haunts of the sea; and now we must follow the animals, and the plants too, from salt water to fresh, and then on to the dry land. It must be understood that there was not a single great emigration out of the sea—things rarely happen that way; there were many emigrations at different times and undertaken by different races.
