On the Height of Orford Mountain. 225 



the case, that those hills must have stood relatively lower 

 than at present. This hypothesis is then applied to the 

 explanation of certain high level terraces near the inter- 

 national boundary line, and the deformation of gravel beds 

 around Lake Memphremagog and along the Coaticook and 

 Salmon rivers. But in view of the evidences of ice action 

 at a much greater altitude than 1800 feet, the hypothesis 

 may be no longer needed. And as Mount Orford is the 

 highest point mentioned in the area under discussion, it 

 is, therefore, apparent that the maximum elevation reached 

 by the ice of this region in glacial times has not yet been 

 ascertained, and is not likely to be from evidence obtain- 

 able in the Eastern Townships. 



On the Height of Orford Mountain. 



N. N. Evans and 0. E. Leroy. 



A good deal of interest is attached to the height of 

 Orford Mountain, not only because its peak is frequently 

 ascended by excursionists to view the magnificent pano- 

 rama of lake and river, mountain and valley spread out 

 before them when standing upon its summit, but also 

 because certain geological theories involving a more or 

 less accurate knowledge of the elevation are under discus- 

 sion at the present time ; and the various figures given for 

 the height vary so widely as to be quite unreliable. 



The recent excursion of the Natural History Society of 

 Montreal to Orford offering a very favorable opportunity 

 for a barometric determination of its height, the writers 

 made careful observations upon that occasion ; and as 

 much interest in the result was expressed by many mem- 

 bers of the Society, it was thought advisable to publish 

 the figures thus obtained, as offering probably the most 



