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 motive engineer, and so on. So far as the things they are interested in and can do is concerned, they are now very different. Even in appearance they have changed a good deal, too, because of these differences in their businesses. But they have changed most of all in their minds. So the forms of animals, as well as their parts, change because of the kind of lives they lead. But it makes it more interesting, sometimes, just to play things; and we are playing now, that the crawfish turned into an oyster.

In the next chapter we will open Mr. Oyster's plain old shell and see what Mr. Crawfish was "up to" when he turned hermit, and went into a shell castle to think things over.