LXXVIII THE ROYAL SOCIETY OF CANADA 



International Boundary Surveys. 



The survey and demarcation of the 141st meridian was completed 

 in the year 1912 between the Arctic Ocean and Natazhat Ridge, 

 south of White River, leaving about 90 miles to be surveyed between 

 the Ridge and Mt. St. Elias. This is a region of high mountains, 

 ice fields and glaciers. Mt. St. Elias is about 18,000 feet in height, 

 Mt. Logan, farther north and to the east of the meridian 19,500 

 feet, and there are several other mountains of height not much less. 

 The boundary line last year was produced across this region, measure- 

 ments carried through by triangulation, a topographic survey of the 

 vicinity of the line made with photographic camera and plane table 

 and the final monuments at such points as were available, under the 

 general conditions of perpetual snow or ice. This completes the 

 field work of this survey. 



At the southern end of the Alaska Boundary a triangulation 

 was undertaken to determine the course of the boundary between 

 Cape Muzon and the entrance to Portland Canal, and to connect 

 the triangulation along the Alaska-British Columbia boundary 

 with the Geodetic Survey of the British Columbia Coast. These 

 operations were interrupted by a landslide at Cape Muzon, in which 

 two unfortunate men, members of the boundary survey party, lost 

 their lives. This section of the triangulation therefore had to be left 

 over to the present year. 



On the Ontario-Minnesota boundary, the survey of Lake of the 

 Woods was completed, also of Rainy River and Rainy Lake in great 

 part. 



On the Quebec Maine boundary, the survey was completed 

 (from the eastward) as far as the southwest branch of River St. John, 

 which also was in part surveyed. It is intended this year to complete 

 the survey of this river to its source and to enter upon the survey of 

 the boundary along the Highlands. 



The surveys in Passamaquoddy were completed and a number 

 of marks placed to indicate the boundary. 



Geodetic Survey. 



Triangulation was carried on in British Columbia, Quebec, 

 southern Ontario, and in northwestern Ontario, westward from 

 Thunder Bay. The standard of accuracy has been maintained in 

 this primary work. 



A base line, 13-5 kilometers in length, was measured near Belle- 

 ville, Ont., using three invar tapes, 50 metres long. 



