HUNTING FOR ANIMALS OF PAST AGES 35 



tinct lines of the models of each age clearly fix it, 

 with those who know fossils, as belonging to a 

 definite age, even though not branded with the 

 number of that age. 



"In number Two layer the fossils show an 

 increase in number and an improvement in 

 pattern. With a little study one would re- 

 member where these peculiar fellows belong, 

 even though number Two is not branded on 

 them. 



"Numbers of animals died before the close of 

 the age in which they appeared. Those that 

 through their descendants lived on into the next 

 age showed evolutionary change improvement 

 over original appearance. Occasionally, too, 

 in a layer was an entirely new fossil. By the 

 time layer number Fifty is reached the fossils 

 show multiplied kinds and marked improvements 

 in every vital point and have a much better ap- 

 pearance than those in numbers One and Two." 



All life progressed with age. And as one ex- 

 amines the fossils in the layers closer and closer 

 to the top, the fossil life shows speedier forms, 

 better teeth, and larger brains. In the layers or 

 ages immediately preceding the one in which we 

 live many kinds of life have the form of to-day; 

 and other kinds, in fact nearly all the birds, 

 flowers, and animals, have long been nearly as 

 they are to-day. 





