CHAPTER V 



THE CONQUEST OF THE DRY 

 LAND 



Tell-tale Evidences of Marine Ancestry Origin of Land 

 Plants The Three Great Invasions of the Dry Land 

 New Ways of Breathing Changes in Movements New 

 Ways of Looking after the Young New Kinds of Pro- 

 tection Betwixt-and-Between Animals Haunts within 

 Haunts Beneath the Ground Cave Animals. Arboreal 

 Life. 



OVER and over again in the history of 

 animal life some adventurous members 

 of aquatic races have become colonists of the 

 dry land. Perhaps we should not be quite 

 wrong if we said, a little fancifully, that one 

 of the great unspoken wishes of animals was 

 to get out of the water. In any case, it is 

 almost certain that the great majority of the 

 different classes of land animals had their an- 

 cestry in the sea, some of them making the 

 transition which might require millions of 

 years through fresh waters. 



We must be careful here to see the facts 

 clearly. Land mammals had their origin in 



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