THE LIVING STRUCTURES 159 



a work of art. Intelligence and skill of the highest order 

 is required to produce these well balanced and highly 

 complicated structures we call animals and plants. The 

 common frog is a good illustration of the course and gen- 

 eral development of an animal. He begins as a single 

 cell which multiplies into enormous colonies which again 

 group themselves into a fish. This fish gradually changes 

 into the perfect animal or frog. This shows how the 

 cells start building with a purpose and continue as far as 





FIG. 32. Tadpoles and Frog; a, tadpole with branching external gills; b, 

 gills absorbed and hind legs have appeared; c, fore legs have appeared; d, tail 

 shrunk and legs enlarged; e. perfect, young frog, tail entirely disappeared. 

 The figures represent some stages in the life history of the frog. SCHUTE. 



they have had experience. This particular kind of cell 

 has been building these structures, and that is the extent 

 of its skill and experience. In the same manner some peo- 

 ple or animals have had experience in building certain 

 kinds of structures and houses, and they always build 

 those and none other because they are the only kind they 

 know how to build. That point will be more fully consid- 

 ered under the Cause of inheritance. 



It must be clear to the reader by this time that all 



