TERRESTRIAL MAGNETISM. 149 



enters the Indian Archipelago, where the declination, 

 inclination, total force, and line of minimum intensity of 

 the total force, and of maximum intensity of the hori- 

 zontal force, have all been investigated with admirable 

 exactness, in 1846 1848, by Captain Elliot. Here the 

 line of no declination passes immediately to the south of 

 the Island of Flores, through the small " Sandal Wood " 

 Island, ( 191 ) and from 120 to 94 E. long, in a due east 

 and west direction; as, indeed, Barlow had laid it down 

 correctly sixteen years before. From the last-named 

 meridian, and about 9^ S. lat., it seems probable 

 judging by the line of 1 E. declination which Captain 

 Elliot has traced up to Madras that the line of no 

 declination takes a new direction trending to the north- 

 west. It is impossible at present to form any certain 

 conclusion as to whether, in its further prolongation, it 

 cuts the geographic equator in the meridian of Ceylon, 

 and enters the continent of Asia either between the Ghilf 

 of Cambay and Gruzerat, or further to the west in the 

 Bay of Muscat, ( l92 ) and so is identical with the curve 

 of no declination, ( 193 ) which appears to run to the south- 

 ward from the shores of the Caspian ; or whether, on 

 the contrary (as Erman thinks), it bends back to the 

 east, and passes between Borneo and Malacca, and, 

 ascending towards the north, reaches the Sea of 

 Japan, ( l94 ) and enters North-eastern Asia through the 

 Sea of Ochotsk. It is greatly to be regretted that the 

 very numerous determinations which must have been 

 obtained in the frequent navigation to India, Australia, 

 the Philippines, and the north-east coast of Asia, have 

 not yet been co-ordinated and rendered conducive to 

 general views, by connecting the south of Asia with its 



