OF REMOTE AGES. 35k 
edge of a knife, the joints being finer than the 
thinnest paper, just sufficient to make the observer 
aware that the entire wall is not composed of one 
single stone. 
‘¢ No cement has been made use of, and on the 
outside all the stones have been worked to a 
convex surface. What renders this work more 
extraordinary, is, that a large and imperfectly 
squared stone succeeds to a small one, and the one 
above them accommodates itself to the inequalities 
of both, no less than to the convexities and irre- 
gularities of the surfaces of each, and all this 
with such perfection, that, on whatsoever side it is 
examined, the same exactness may be observed. 
‘‘ The walls are about 24 toises (15 to 16 feet) 
high, and from three to four feet thick.” — Ulloa, 
book vi. chap 11. 
The round tower of Kilmacdaugh, in Ireland, 
built probably about the 9th century, 110 feet 
high, is built of stones of all sizes, some extremely 
large, fitted together precisely like those of 
the Cyclopian fortresses of Greece. 
