O'Reilly — On the Onentation of Some Cromlechs. 591 



teing north 1° 46' west^ or say a degree and a-half from the true north 

 ^nd south. Even supposing that the stone had been originally oriented 

 true north and south, the lapse of time, with all its attendant accidents 

 and the corrosive action of the atmosphere, would reasonably account foi 

 the actual slight difference at present shown, the roughness of the stone 

 surface not allowing a closer approximation of direction than a degree 

 at best. It is remarkable that the western extremities of the north- 

 west and south-west stones lie also in a line nearly due north and south, 

 the difference tlierefrom being 1° 46' west ; how far this was originally 

 intended can only be conjectured at present. Looking at the eastern 

 •end of the cromlech, as shown in the elevation (Plate XIII., fig. 1), it 

 will be remarked that the south-east stone bearing the north and south 

 face is on the left-hand side of the observer. This arrangement also 

 presents itself in the cromlech of Brennanstown. It may not be out of 

 place to further note that both the one and the otlier are situated in the 

 vicinity of streams. 



Glen Druid Ckomlech. 



(Plates XIY., XV., XVI.). 



The Brennanstown or Glen Druid cromlech is situated in a small 

 secluded valley or glen, situated about 500 yards to the east of Carrick- 

 mines Kailway- station, which is overlooked by a square tower forming 

 a notable landmark from many points in the vicinity, and shown in 

 Wakeman's sketch (loc. cit. p. 70). The monument lies at the head of 

 the Glen to the west, and close beside a stream which seems to have 

 been the principal agent in carving out from the granite the Glen, of 

 Avhich the direction in this point is nearly east and west, and presumably 

 corresponds to a main line or lines of jointing. O'Neill, after giving 

 the dimensions, states: — "The direction is east and west, the floor 

 clay, and considerably lower than the surface of the field. There are 

 several large stones lying about, and tolerably decided indications of 

 some of them having been arranged to form two parallel lines of 

 -approach to the lower end of the monument." Wakeman calls it "a 

 very perfect cromleac," describes it summarily, and says, " A number 

 of detached stones lying about this very perfect example would indicate 

 that it was originally accompanied by a circle of pillar-stones." 



The section and elevations on Plates XIV., XV., and XVI. will 

 ■enable a more complete and accurate estimate to be made of this very re- 

 markable monument. The stones are all of granite, which is the rock of 

 the Glen. They are in an excellent state of preservation, and have not 

 seemingly suffered any serious derangement. It will be seen from the 



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