PLATE XI. 



ENLARGED VIEW OF A PART OF THE APENNINES. 



This plate shows a portion of the Apennines near the Palus Putredinis, an embayment of the 

 M. Serenitatis where it breaks through the mountain wall and nearly connects with the M. 

 Imbrium. The three large vulcanoids are Archimedes, Autolycus, and Aristillus. The very 

 steep or even undercut character of the front of the Apennines is well-known. So, too, the varied 

 condition of the old craters, breached on the side towards the mare. These features strongly 

 suggest a melting action of the once-fluid lava of the mare. 



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