THE DINOSAURS 93 



disported themselves along the reedy margins 

 of lakes and rivers. 



They had their day, a day of many thou- 

 sand years, and then passed away, giving 

 place to the superior race of mammals which 

 was just springing into being when the huge 

 Dinosaurs were in the heyday of their exist- 

 ence. 



And it does seem as if in the dim and distant 

 past, as in the present, brains were a potent 

 factor in the struggle for supremacy ; for, 

 though these reptiles were giants in size, domi- 

 nating the earth through mere brute force, 

 they were dwarfs in intellect. 



The smallest human brain that is thought to 

 be compatible with Hfe itself weighs a little 

 over ten ounces, the smallest that can exist 

 with reasoning powers is two pounds ; this in a 

 creature weighing from 120 to 150 pounds. 



What do we find among Dinosaurs ? Thes- 

 pesius, or Claosaurus, which may have walked 

 where Baltimore now stands, was twenty-five 

 feet in length and stood a dozen feet high in 

 his bare feet, had a brain smaller than a man's 

 clenched fist, weighing less than one pound. 



