ABSTRACT OF MAGNETICAL OBSERVATIONS. 



of Ida island in transit with Seymour point, 

 broken scoria, not magnetic. 



49 



Eed clay ground with 



23. DOBBO, ARU ISLANDS, 



24. AMBOINA, 



fLat. 5 45' 15' a 

 (Long. 134 14 15 E. 



On a grass plot between the village and the forest, nearly in line 

 with the main street, and 40 yards s.s.w. from a well at the end of it, 

 26 yards s. hy E. from another welL Free from disturbing causes. 



f Lat. 3 41' 40" s. 

 (Long. 128 9 15 E. 



On a level piece of grass. 100 yards from the shed of the coaling 

 station at Point Mungayen, and nearly in line with the direction of 

 the pier. The observing table was at the northern part, near the em- 

 bankment which surrounds the grass plot The ground contained 

 iron, but in very small quantities. Stones, serpentine and mica schist. 



25. TERNATE, 



26. SAMBOANGAN, 



fLat. 047'25"N. 

 ( Long. 127 20 45 E. 



In a grass field surrounded by trees, 100 yards inland from the 

 coaling pier, and about 50 yards from the owner's house. Although the 

 neighbouring hills were covered with volcanic sand, containing much 

 iron, they were sufficiently distant from the observation spot to avoid 

 magnetic disturbance. 



| Lat. 6 55' O"N. 

 (Long. 122 45s. 



A small grass field in a cocoanut plantation, 600 yards to the west- 

 ward of the church, and 100 yards from the beach. The earth con- 

 tained very little iron, the stones being decomposed lava. 



The same spot was used on the second visit, the heat on that occasion 

 being intense. 



27. ILO-ILO, . 



("Lat. 1042'15"N. 

 (Long. 122 34 15 E. 



260 yards N.E. of the fort on the extremity of the sandy spit near 

 the town of Do-Ilo. 



28. MANILA,. 



VOL. IT. 



/Lat. 1435'25" N . 

 (Long. 120 58 15 E. 



On the exercising ground near a lunette, on the s. side of the city, 

 63 paces from a tree about the middle of the Alameda, near the beach ; 

 98 paces from the main road running east and west, and 60 yards from 

 the telegraph wire. 



G 



