>t took to duz.v/eAop cKo.rcxc.tee-ist.ic. 



modern -forms of lif 

 YictveWk oiztlze 

 f nom, 5 to 5 million. 



forerunners 

 o modern. 



5 to lo 

 "million ears 

 to 



ancient/ 

 ancestors 

 of plants' 

 ancC animals 

 took 15-25 

 million years 

 to develop , 



naost forms 

 are nov"<s*.tinct 



amph ibictns 



\ 

 andi 



verv simple 

 of living" 



simple plcmts 

 and r - 



. 



miuioyi yars 



YZO 



many many 

 yearns* 



tnillion 



"no 



What are a few million years in the history of this old earth ? 



H. & w. sci. 116 



225 



