no 



Land Magnetic Observations, 1905-10 



The whole work may be summarized as follows: More or less complete magnetic observations, 

 according to the conditions encountered, were made at each of the following points: 



1. Kingston, Jamaica. 



2. Colon, Panama. 



3. Cartagena, Colombia. 



4. Savanilla, Colombia. 



5. Bridgetown, Barbados. 



6. Bathsheba, Barbados. 



7. Georgetown, British Guiana. 



8. Arakaka, British Guiana. 



9. Barima Mine, British Guiana. 



10. Mount Everard, British Guiana. 



11. Morowhana, British Guiana. 



12. Suddie, British Guiana. 



13. Bartica, British Guiana. 



14. Tumatumari, British Guiana. 



15. Potato Mission, British Guiana. 



16. Kangaruma, British Guiana. 



17. Tukeit, British Guiana. 



18. Kaieteur Falls, British Guiana. 



19. Rockstone, British Guiana. 



20. Wismar, British Guiana. 



21. Malali, British Guiana. 



22. New Amsterdam, British Guiana. 



23. Springlands, British Guiana. 



24. Paramaribo, Dutch Guiana. 



25. Onverwacht, Dutch Guiana. 



26. Albina, Dutch Guiana. 



27. Cayenne, French Guiana. 



28. Regina, French Guiana. 



29. lie Royale, French Guiana. 



30. St. Jean, French Guiana. 



31. Sault Hermina, French Guiana. 



32. Brownsweg, Dutch Guiana. 



33. Gronigen, Dutch Guiana. 



34. Nieuw Klarenbeck, Dutch Guiana. 



35. Frankville, British Guiana. 



36. Oreala, British Guiana. 



37. Georgetown, British Guiana, reoccupation. 



38. Port of Spain, Trinidad. 



Of these, Nos. 1,5, and 38 are C. I. W. repeat stations; Nos. 11 and 29 are practical reoccupations 

 of stations established by earlier observers. Little evidence of local disturbance was found in 

 the localities near the coast, this region being formed by sedimentary deposits of the large 

 rivers, Orinoco and Amazon, as well as of the smaller rivers traversing the region. Inland, 

 along the ridges, outcroppings of rock seem to be magnetic in some places. The station at Sault 

 Hermina showed local disturbance. 



The natural difficulties of travel encountered in the execution of the work were largely over- 

 come by reason of the cordial and effective cooperation received from the official representatives 

 of the countries traversed and from various private citizens. These acts of assistance were so 

 numerous that only a general acknowledgment can be made here. 



J. C. Pearson, on Magnetic Work in Western Canada, August to October, 1907. 



In pursuance of instructions, I left the magnetic survey vessel Galilee at Sitka, Alaska, in 

 August, 1907, to establish magnetic stations in the Yukon Territory, Canada, and to reoccupy 

 as nearly as possible Ogilvie's stations of 1887. This portion of the work was completed about 

 the middle of September, after which the trip was continued to Vancouver, British Columbia, 

 where instructions for additional work in Canada were received ; the work was finally completed 

 on October 16. 



The instrumental outfit consisted of theodolite-magnetometer No. i, dip circle No. 35, pocket 

 chronometer Kittel No. 253, Hamilton watch No. 54, magnetic observing tent No. 10, and mis- 

 cellaneous appurtenances. 



The following stations were occupied in the order given : 



1. Whitehorse, Yukon Territory. 



2. Dawson, Yukon Territory. 



3. Forty Mile, Yukon Territory. 



4. International Boundary, Yukon Terri- 



tory, comprising 



a. C. I. W. Station on newly deter- 



mined boundary line, 



b. Ogilvie's "International Boundary," 



2 miles east of boundary. 



5. Stewart, Yukon Territory. 



6. Fort Selkirk, Yukon Territory. 



7. Tantalus, Yukon Territory. 



8. Ashcroft, British Columbia. 



9. Glacier, British Columbia. 



10. Norway House ,N. W. T., comprising 

 Station A, the principal and perma- 

 nently marked station. 



Station B, secondary station for testing 



local disturbances. 

 Station C, secondary station for testing 



local disturbances. 



11. Warren's Landing, Northwest Terri- 



tories. 



12. West Selkirk, Manitoba. 



Of these stations in the Yukon district, all except Whitehorse and Dawson were in the vicinitj' 

 of Ogilvie's points of observation. No information, however, could be obtained from the in- 

 habitants concerning any of Ogilvie's stations, nor could any marks or other evidences of his 

 magnetic work be found. 



