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Proceedings of the Royal Irish Acadetni/. 



plan (fig. 1) that the orientation of the chamber is very perfect. The- 

 difference from true bearings not being more than 1^°, or quite witliin 

 the degree of accuracy of measurement, which the present states of the 

 surfaces of the stones can allow, no matter what the care tahen. The 

 orientation east and west is tiue only for the northern side of the 

 chamber, while the southern side presents quite a different direction, 

 that of about 36° north of east, and south of west, while the two end 

 stones closing in the west and east sides of the chamber are nearly 

 parallel in direction, but do not lie in the north and south plane. The 



Fig. 1. — Glen Druid. 



soutli-east stone is broken in two, and the halves have undergone a 

 slight derangement of position. Tlie chamber was therefore oiiginally 

 composed of six stones and the cap ; of these four still support the 

 latter, while the two end stones are not in contact witli it. 



This is shown by the westein elevation of the monument (PI. XIV.) 

 and the interior view looking west (PL XV.), as also by the west and 

 east section (PI. XVI.). The space between the central western stone 

 and the under surface of the cap is about 18 centimetres (= 7i inches), 

 and must have originally so existed. Moreover, this central stone 



