MAGNETIC OBSERVATIONS. 



137 



D 



o 



55 



a 



j 



O 



6 



0! 



K 

 B 







O 



U 



n 

 A 



t, 



i 



9 



X 



p 



fc. 



o 

 w 



5; 



O 



H 



S 



O 



as 



H 

 O 



g 





- 



o 



18 August, 1872. 



