280 HISTORICAL GEOLOGY 



primitive Birds, and small, primitive Mammals. Reptiles, which 

 began in the very late Paleozoic, developed marvellously during 

 the era, thus justifying the application of the term "Age of 

 Reptiles" to the Mesozoic. 



On the accompanying chart the author has brought together 

 in concise form the salient facts regarding the life of the Mesozoic. 

 In regular order, the principal successive changes in the sub- 

 kingdoms and classes of plants and animals are graphically repre- 

 sented. 



