48 



WEST COAST OF 



breezes more westerly ; so that, as the coast also 

 trended off the northward, a more rapid advance was 

 made. 



On passing Cape Corrientes, the Tres Marias 

 Islands came in sight ; and if they be passed to the 

 south-eastward, at the distance of eight or ten 

 leagues, and a N. N. E. course steered, Piedra Blan- 

 ca de Mar, off San Blas^ will be readily got sight of. 

 This is a round, bold, white rock, in latitude 21° 

 34f' north, and longitude 105° 32^' west, and being 

 one hundred and thirty feet high, forms an excellent 

 land-mark. It lies exactly eleven and three-quar- 

 ters of a mile nearly due west from the harbour of 

 San Bias, which is pointed out by another white 

 rock, bearing south, 83° east from the former. Close 

 round this last rock, called Piedra de Tierra, on the 

 eastern side, lies the anchorage. The coast between 

 Cape Corrientes and San Bias is full of deep and 

 dangerous rocky bights. It is little known, and 

 ought not to be approached. Care should also be 

 taken, in the night-time, to keep clear of a small 

 cluster of low rocks, which lie twenty-two miles to 

 the N. N. W, of Cape Corrientes. We made them 

 in latitude 20° 43' north, and longitude 105° 5 T V 

 west, Vancouver places them in latitude 20° 45^ 



