On the Height of Orforcl Mountain. .227 



readings, reduced to sea-level, furnished the corrections 

 necessary to eliminate barometric changes due to varying 

 weather conditions. Observations of temperature were 

 made simultaneously with the barometric observations, 

 and these furnished further corrections in the calculation 

 of the results. 



The elevations above sea-level thus obtained were as 

 follows : 



Station. 



Gary. 



Ust.-Rein. 



Windsor Station 



130 feet. 



127 feet. 



Orford Siding 



929 " 

 2642 " 



934 " 



Summit of mountain. , . 



2683 " 



The agreement between the results is quite as close as 

 could be expected, but it would be of much value could a 

 series of such observations be obtained, as the mean of a 

 large number of results naturally carries more conviction 

 with it than that deduced from only two. However, it 

 may be considered certain that the height of Orford 

 Mountain is, in round numbers, two thousand six hundred 

 and fifty feet above the level of the sea. 



It might be of interest to add that upon a clear day 

 Montreal Mountain is visible from Orford, as was the case 

 upon the occasion of the excursion above mentioned, and 

 conversely, under favorable conditions, Orford is visible 

 from Montreal Mountain, being seen above and beyond 

 the middle of the Shefford Mountain group. This group,, 

 as viewed from Montreal, consists of a long ridge towards 

 the observer's left, rising towards the right into twa 

 rounded bosses ; Orford is seen over the ridge. 



McGiLL College, June, 1900. 



