436 APPENDIX. 



loaf shaped grassy hill to the southward of it. After which 

 you may bear away for the anchorage, taking care not to open 

 the sugar-loaf again to the westward of the pointed rock f. 

 The best anchorage, Ten-fathom Hole excepted, which it is 

 necessary to warp into, is at the northern part of the harbour 

 where the anchor is marked in the plan. 



In bringing up, take care of a spit ivhich extends off the 

 south end of the small island near Ten-fathom Hole, and not 

 to shoot so far over to the western reef as to bring a rock, at 

 the outer foot of the south hlnff, in one with some black 7'ocks 

 which will be seen near vou to the south-westward. The 

 depth of water will be from eighteen or twenty fathoms, clay 

 and sand. 



If the wind be from the northward, beat between the line of 

 the afore-mentioned Stigar Loaf and Pointed Bock westward, 

 and a north and south line from the Castle Rock to the east- 

 ward. This rock on the western side, as well as the bluff to 

 the northward of it, may be shaved if necessary. The hand- 

 leads are of very little use in beating in here, as the general 

 depth is twenty or twenty-four fathoms. 



The best watering-place is in Ten-fathom Hole. It is 

 necessary to be cautious of the sharks, which are very nume- 

 rous in this harbour. It is high water 6h. 8m., full and change. 



TRES MARIAS AND SAN BLAS. 



WEST COAST OF MEXICO. 



The Tres Marias, situated lo 15' west of San Bias, con- 

 sist of three large islands, steep and rocky, to the westward, 

 and sloping to the eastward with long sandy spits. Off the 

 S. E. extremity of Prince George's Island (the centre of the 

 group) we found that the soundings decreased rapidly from 

 seventy-five fathoms to seventeen, and that after that depth 

 they were more regular. Two miles from the shore we found 

 ten and twelve fathoms, bad holding ground. There is no- 

 thins^ to make it desirable for a vessel to anchor at these 



t This rock is white on the top with birds* dung, and looks hke an 

 island. 



I 



