464 EXPEDITION TO POINT BARROW, ALASKA. 



The topography of the accompanying map is compiled from surveys of 1853 (by Captain 

 Maguirc, R. N.), of 1881-'S3 (by Lieutenant Ray, U. S. A.) ; for the positions and names of the 

 small lakes northwest f Uglaamie I am indebted to Sergeant Murdoch; the two astronomical 

 stations are laid down by their observed latitude and longitude. The distribution of the magnetic 

 declination for 1883 is shown by two isogouic lines, the direction and distance of which arc taken 

 from my paper on the distribution of magnetism in the United States (Coast and Geodetic Survey 

 (Report for 1882, Appendix No. 13). The isoclinic and isodynamic (horixoutal force) lines incline 

 about 50 "W. of N., or about 5 more than the isogonic lines, but no precise data are available. 



