The Reptiles 



proper Incubation; that the heart now has four chambers 

 instead of three as in the preceding class; that the special 

 senses are more highly organized; that the size of the 

 brain has increased and bodily activities have been greatly 

 extended; that life on land was completely emancipated from 

 its former life in the sea, the primal home of all life; that 

 leathery wings were developed by which animal bodies were 

 first transported through the air; that the digestive system 

 was changed to meet food conditions on land; that many 

 forms of body armor and body weapons were developed 

 to aid them in their struggle for survival. All of these 

 changes were improvements over the body functions of the 

 amphibians and not only placed life on a higher scale, but 

 prepared it for the next great step of animal progress. 



It was during this period that the most gigantic life 

 forms were developed. This was, indeed, an age of mons- 

 ters. Many species of dinosaurs, both carnivorous and her- 

 bivorous came into being. These were species of lizards — 

 some giants, some pigmies — some the size of a chicken and 

 some eighty feet long and standing nearly thirty feet high. 

 There were huge flying crocodiles and flying serpents. Some 

 of the giant, clumsy vegetarians attempted to grow a brain 

 in their tails. Some had massive hind legs and massive tails 

 which were used as a tripod when the lizard reared up to 

 feast upon the tops of the pahns and ferns. These vege- 

 tarians developed the thickest armor and the flesh eaters 

 developed the biggest and the sharpest teeth. 



The flying crocodiles were insect eaters. As these devel- 

 oped their forelegs into wings and took to the air in quest 

 of their favorite food, we find the forces of Evolution, 



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