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Mr. PETEIE'S Inquiry into the Origin and 



apertures, when the original doorway is quadrangular, are always of the same 

 form, as shewn in the annexed illustrations of the lower and upper doorways 

 of the Round Tower of Swords. The lower doorway is at present but three 

 feet above the level of the ground, and measures six feet in height, two feet 

 in width at the top, and two feet two inches at the bottom. The second 

 aperture, which is twenty feet from the ground, is four feet in height, and two 

 feet in width. The church of Swords owes its origin to the great St. Columb- 

 kille, and was originally erected previously to the year 563. 



As a similar example of the quadrangular doorway, but of better masonry, 

 I subjoin an illustration of the doorway of the Round Tower of Antrim. This 



doorway, .which is placed at an elevation of about twelve feet from the ground, 

 is constructed of large blocks of coarse-grained basalt found in the neigh- 

 bourhood, many of the stones extending the entire thickness of the wall, which 

 is three feet three inches. It is but four feet four inches in height, one foot 

 ten inches in width at the top, and two feet at the bottom. 



This doorway is remarkable in having a pierced cross within a circle, 



