the adjoining pier-stone (the seventh from the angle of the pier) 

 and found to be 18-15 feet below it. 



Inishgort. — August 26. There are no tidal observations at this 

 station. The cistern of the barometer was found to be 4*2 feet 

 above the base of the Lighthouse Tower. 



Kilrush. — September 1. There was no re-measurement at this 

 station, the tide-gauge having been destroyed by the violence of the 

 sea. 



Cahirciveen. — September 2. The zero of the tide-gauge was 

 found to be 23*50 feet below the provisional mark, which is on the 

 upper surface of the coping-stone of the pier of the bridge, at the 

 north-east angle. 



Castletownsend September 6. The zero of the tide-gauge is 



31*94 feet below the Ordnance bench-mark, which is at the foot of 

 the flag- staff. 



Courtown. — November 11. The Ordnance bench-mark at this 

 station is a bolt driven vertically in one of the coping-stones on the 

 north side of the channel to the harbour. The zero of the tide- 

 gauge is 17-13 feet below it The cistern of the barometer is 25-14 

 feet above the bench-mark. 



Dunmore East November 12. The Ordnance bench-mark is 



a vertical bolt driven into one of the coping-stones of the pier, not 

 far from the Lighthouse. The zero of the tide-gauge was found to 

 be 17-59 feet below it 



The levellings taken at Portrush and Dunmore differ considera- 

 bly in their results from those of the preceding year. This is due to 

 the circumstance that the tide-gauges were not erected at these sta- 

 tions when they were visited in 1850; and consequently, all that 

 could be then done was to level from the bench-mark to some point 

 near the intended position of the gauge, leaving the rest to be done 

 by the observer. The measures taken in 1850 at these two stations 

 must, under these circumstances, be disregarded. At all the other 

 stations the measures taken in the two years are nearly accordant, 

 and their means will be employed in the comparison of the mean 

 tide levels. 



