Science informs us that these and similar microscopic creatures, number thousands of families or species,—and it is thought that the varieties of microscopic creatures outnumber the varieties of creatures visible to the unaided sight. And, remember, that there is probably a still greater world of "sub-microscopic" creatures, that is a world invisible even when the most powerful microscope is used. Who knows what wonders are to be found there—what forms of creatures live, and move and have their being there.
