EVIDENCES OF EVOLUTION 



69 



At the present time every whale in every ocean uses 

 lungs and not gills when he breathes. Nevertheless, as a 

 reminder of the ancient road which their ancestors traveled, 

 even- embryo of every whale has the double outfit — lungs 

 and gill-slits too. 



Thus it is that rudiments repeat over and over again the 

 long-drawn history of whale life. They show how the struggle 

 for existence drove some earlv ancestors first from water to 

 land, then back again from land to water. Scientists sav that 



Rorqual, the Giant of the Arctic Seas 



One of these whales, captured on the British coast, measured 95 feet in length 

 and weighed 249 tons 



by learning how to live in one environment after another, as 

 they did, whales have shown that they were better fitted to 

 survive than many of their fellow monsters who perished 

 in the struggle. And all this lends a glow of romance to our 

 modern whale, yet he himself is as indifferent as if no line 

 of struggling ancestors had made him what he is. 



For the sake of studying the evidences of evolution in 

 close relation to each other, they are now summarized in five 

 separate statements. 



