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&quot; ; con 

 sequently about 20 7 more westerly than appears 

 on Vancouver 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. 



