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1.— TO THE NOETHWARD OF LATITUDE 40° N. 



NUN ROCK, off Cape Wrath, in lat. 58° 52^' N., long. 4° 58' W. 



This rock is a very dangerous isolated patch, bearing N.E. by N. ^ N. 

 (N. S° E. true) from Cape Wrath, the N.W. part of Scotland, 15 miles 

 distant. It is of small extent, not half a mile in diameter, with deep 

 water all around it, and with 3^ fathoms, or, as some say, not more than 

 2f fathoms, over it. It has been seen to break very high at half-tide. It 

 is high water, on full and change, at ll** ; springs run 4 miles an hour, 

 and neaps 2 miles, the flood setting to the eastward. 



Bona, Sulisker, and other isolated rocks lying westward of the Orkney 

 Islands, are described in the Sailing Directions accompanying the Chart 

 of the North and West Coasts of Scotland. 



NORTH SHOAL, West of Oekney, lat. 59= 13' 23" N., long. 3° 35' W. 



This is one of the most dangerous shoals around the British Isles, as it 

 is singularly isolated, and not larger than half the size of a boat. It has 

 but 7 ft. least water, with 10 to 30 fathoms around it, and bears from 

 Noup Head, Westra, West, northerly, distant 17 miles ; from the Brough 

 of Birsa, N.W. by N., northerly, 9 miles ; and from the Old Man of Hoy, 

 N. -I E., 20f miles. In fine weather it is distinctly marked by the ripple 

 of the tide, and in rough weather the sea breaks heavily over it. 



Roche Bonne and the Banche Vebte, in the Bay of Biscay. 



These two rocky shoals, lying a short distance apart, westward of the 

 He de Re, are described in the Sailing Directions. 



Jones Bank, lat. 5P 23' N., long. 14° 25' W. 



Notwithstanding the pams taken to ascertain the exact limits and 

 character of the edge of the bank of soundings off the West coast of Ireland, 

 it does not appear to have been definitely determined. The following are 

 the particulars of a shoal cast of 30 fathoms, about 180 miles westward 

 of Cape Clear, near the S.W. verge of the bank ; a depth of 470 fathoms 

 was found 16 miles to the westward of this position. 



Jones Bank, as this may be called, was found by Captain David Jones, 

 of the barque Achilles, on August 18th, 1864. The vessel was becalmed, 

 and the lead was hove, and showed 30 fathoms most unexpectedly, as 

 above stated. He plumbed several times, and held on to the line, and 

 found the lead at the bottom to drag over the uneven parts of the rock, 

 and brought up a stone sticking to the lead. 



Now, when the nature of the adjacent coast is considered, it may be 

 quite possible that this is an isolated hill of trap rock, like the lofty 

 Skelligs, and may have a much less depth on some of its peaks. It is 



