SUMMARY. 119 



tion gives to every newly discovered fact, the 

 exactness with which the new fossils fall into their 

 places, both as regards their structure and the time 

 at which they lived, have all together led paleon- 

 tologists, as a rule, to conclude that the positive 

 evidence is sufficient to outweigh the numerous dif- 

 ficulties, and indicate that the history of animals 

 has been an evolutionary one of some form. 



