Uses of the Round Towers of Ireland, 



411 



on the preceding page, an illustration of one of those in the Eound Tower 

 of Cashel, which will be further interesting, as exhibiting the curious Etruscan 

 character of the masonry of this, and so many of the other towers and churches, 

 and which will be still better shown in the annexed specimen, from its base. 



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Of these three forms of aperture, we often find examples in the same Tower, 

 as in the three annexed examples, from the Tower of Kells : 





in many of the apertures, however, which exhibit semicircular and angular 

 heads, these forms are only external, and their internal construction preserves the 

 quadrangular form, by a lintel, more or less recessed, which rests upon the 

 jambs, as shewn in the two next illustrations, the first representing one of the 

 angular-headed apertures in the uppermost story of the Tower of Cashel, which 



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