The Tree of Life 



71 



Fig. 14. Genealogical Tree of Animal Life 



This diagram is intended to suggest the common origin of all animal forms, 

 with the constant progressive departure from ancestral types, now in one 

 direction and now in another. Of course only the main branches are shown, 

 as in the corresponding survey of plant life. Figure 13. From Gruenberg, 

 Elementary Biology, published by Ginn & Company. 



