THE EVOLUTION OF PLANTS 



619 



nothing but one particular stage in the evolution of the 

 Vegetable Kingdom." 1 



TABLE VIII 



I. Reign -of Primitive Life, Old P r ec a m- 

 (Hypothetical) brian 



i (Archeozoic) 



(Fossil Algae begin) 

 i. Primitive Protoplasm and 

 Unicellular Life 



In the above table (after Wieland), the groups are to be considered as 

 arranged on an unrolled cylinder, projected from a hemisphere; thus the 

 phyletic lines are to be pictured as diverging upward and the Cordaitales 

 as coming between the Ginkgoales and Filicales, to both of which they 

 are related. 



629. The Element of Geological Time. How many 

 years has it taken for the evolution of the higher Angio- 

 sperms that is, from the dawn of the fossil record in the 



1 Scott, D, H, "Studies in Fossil Botany," p. 3. 



