APPENDIX E CL VII 



The small changes of temperature of the air and barometric pres- 

 sure are recorded by self-registering instruments. By comparison of 

 these records with those of the seismograph, it is hoped that light may 

 be thrown upon the conditions of occurrence of the minute earth tremors, 

 which are of frequent occurrence. 



Observations for the determination of the magnetic declination, in- 

 clination and intensity have been made at a number of points, including 

 seventeen places in British Columbia. It is proposed this year to observe 

 at a large number of points along the north shore of the Eiver and Gulf 

 of St. Lawrence, in a region where little observation of the magnetic 

 elements has been made, at least in recent years. 



Inteenational Boundary Surveys. 



The work on the four sections of the line, referred to last year, 

 namely, the 141st Meridian, the Award Boundary, the 49th parallel, 

 and the line from the Eichelieu Eiver to the St. Croix, has been con- 

 tinued. 



The 141st Meridian has been produced southward to beyond the 

 White Eiver, a distance from the Yukon Eiver, where the survey was 

 begun, of 225 miles. The placing of the permanent monuments and the 

 subsidiary surveying operations have made good progress. 



On the mountain boundary of Alaska and British Columbia, the 

 topographic survey of the region referred to in the agreement of 1905, 

 supplementary to the Award of 1903, has been advanced far enough to 

 enable the Commissioners to make a selection of mountain summits satis- 

 fying the conditions of the agreement; and it is hoped that this section 

 of the line will be completed this year, by the final connecting of these 

 summits, by triangulation, with one another, and with the rest of the 

 survey. Good progress was also made on the line in the vicinity of the 

 Alsek, Iskut and TJnuk Elvers. 



A final inspection was made of the monuments on the 49th parallel 

 west of the Eocky Mountains, and a beginning made on the re-survey 

 east of the mountains, about 100 miles having been retraced and pre- 

 pared for the final monuments which are to be placed this year. 



The re-survey of the line between Maine and New Brunswick was 

 made, beginning from the source of the St. Croix Eiver and extending 

 northward to St. John Eiver. 



A treaty between the United States and Great Britain providing for 

 the re-survey of the whole of the boundary line from the Atlantic to the 

 Pacific was ratified on June 3rd, 1908. This treaty divides the bound- 

 ary line into eight sections, the first of which comprises Passamaquoddy 

 Bay, and the last the water boundary in the Straits of Georgia and Puca, 



