88 Staff-Commander E. W. Creak. [Jan. 28, 



Teneriffe. Canary Islands. 





Decimation. 



Inclination. 



Total force. 



Observer. 





21° 48' W. 



20 00 



55° 18' W. 



52 42 



9 -546 

 9'230 



H.M.S. "Chal- 

 lenger," 1873. 







At this island observations were only made at one land station, but 

 there is evidence of a strong development of bine magnetism at the 

 observing station. 



Santa Cruz is on the east side of the island, and the westerly 

 declination was found to be in excess of the normal value by If °. The 

 inclination was 2-^°, and the force 0*3 in excess of their respective 

 normals. 



St. Vincent. Cape de Verde. 





Declination. 



Inclination. 



Total force. 



Observer. 





17° 3'W. 

 18 52 



43° 6'N. 



8-577 



H.M.S. "Chal- 





19 54 



42 52 



8-540 



lenger," 1876. 



The observations were made on the west side of the island. Here 

 the principal disturbance occurs in the westerly declination, which is 

 nearly 3° in defect of the normal value. This points to the presence 

 of increased blue magnetism on the inland side of the observing 

 station. 



The inclination and force are but little affected. 



St. Paul Rocks. (Atlantic Ocean.) 





Declination. 



Inclination. 



Total force. 



Observer. 





16° 22' W. 

 15 51 



22° 32' H"i 

 22 30 



7'00 

 6-94 



H.M.S. "Chal- 

 lenger," 1873. 







At these rocks the declination and total force are slightly disturbed, 

 the inclination agreeing well with the normal. 



