90 TITTMANN— PROGRESS OF THE DEMARCATION [April 24, 



to be in longitude 141° 00' oo".4, a very close hit. It is interesting 

 to note also that the final longitude differed only 9"-43 of an arc, or 

 410 feet, from that derived by moon culminations about twenty years 

 before. 



The work of tracing the boundary southward from the Yukon 

 was begun in the spring of 1907. and was carried southward a dis- 

 tance of about one hundred and twenty miles. Aluminum-bronze 

 monuments were erected on the north and south banks of the river, 

 a trigonometric and topographic survey was made extending two 

 miles on each side of the boundary for a distance of about forty-five 

 miles, and a broad vista was cut through the woods for the same 

 distance. The work planned for the coming season will carry the 

 tracing of the line as far as the great mountains south of the White 

 River, and the topographic survey and the monumenting will be 

 pushed until the severity of the weather compels the surveyors to 

 abandon the work and turn their faces homeward. 



