ASTRONOMICAL OBSERVATIONS. 67 



the declination of the needle as 27" 30' east. 

 According to this, the promontory of Mount 

 Edgecumbe is in the longitude 136° 1' 49 ' ; con- 

 sequently about 20' more westerly than appears 

 on ^"ancouver's map. 



We found a similar difference between our 

 observation of St. Francisco and his; I there- 

 fore believe that his whole survey of the north- 

 west coast of America represents it more east 

 erly than it really is. Our longitudes have 

 the greater claim to confidence, as they were 

 the results of repeated observations on land, 

 while his were merely taken on shipboard en 

 passant. 



The medium of our observations at New 

 Archangel upon the difference in high tides at 

 the new and full moon, gave thirty minutes for 

 the time, and sixteen feet for the greatest dif- 

 ference in the height of the water. 



